The magnitude and direction of A - B are 94.868 units (rounded to three decimal places) and 270 degrees relative to due west.
To find the magnitude and direction of the resultant vectors A + B and
A - B, we can use vector addition and subtraction.
(a) To find the magnitude and direction of A + B:
The vectors A and B are perpendicular to each other since A points due west and B points due south. Therefore, we can use the Pythagorean theorem to find the magnitude of the resultant vector:
Magnitude of A + B = √(Magnitude of A)^2 + (Magnitude of B)^2
= √(67^2 + 67^2)
= √(2 * 67^2)
= √(2) * 67
= 94.868 units (rounded to three decimal places)
The direction of A + B can be found using trigonometry. Since vector A points due west (180 degrees) and vector B points due south (270 degrees), the resultant vector A + B will lie in the fourth quadrant.
Angle of A + B = arctan ((Magnitude of B)/(Magnitude of A))
= arctan(67/67)
= arctan(1)
= 45 degrees
Therefore, the magnitude and direction of A + B are 94.868 units (rounded to three decimal places) and 45 degrees relative to due west.
(b) To find the magnitude and direction of A - B:
The magnitude of A - B will be the same as the magnitude of A + B since the magnitudes of A and B are equal. However, the direction will be different.
The direction of A - B can be found by subtracting the angle of vector B from the angle of vector A. In this case:
Angle of A - B = Angle of A - Angle of B
= 180 degrees - 270 degrees
= -90 degrees
Since -90 degrees is equivalent to 270 degrees (in the third quadrant), the direction of A - B is 270 degrees relative to due west.
Therefore, the magnitude and direction of A - B are 94.868 units.
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3. Florence, who weighs \( 560 \mathrm{~N} \), stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is decelerating while moving downward at \( 2.50 \mathrm{~m
When the elevator Florence is in deceleration while moving downward at 2.50 m/s², the bathroom scale she is standing on will read 3876.8 N.
When Florence, weighing 560 N, stands on a bathroom scale in an elevator, the scale reading will be different when the elevator is decelerating while moving downward at 2.50 m/s². In this situation, the scale reading will be less than Florence's actual weight.
Decelerating implies a negative acceleration, indicating that the elevator is accelerating in the opposite direction of its motion. As the elevator descends, it needs to accelerate in the opposite direction to slow down.
To solve this problem, we can use the concept of a free-body diagram. When Florence stands on the bathroom scale, her weight of 560 N pulls down on the scale. Since the elevator is moving downward, it experiences a downward acceleration of -2.50 m/s². Therefore, the scale force can be calculated as F_s = m(a + g), where a is the elevator's acceleration and g is the acceleration due to gravity.
Plugging in the given values:
F_s = m(a + g)
F_s = (560 N)(-2.50 m/s² + 9.81 m/s²)
F_s = 3876.8 N
Hence, the scale will read 3876.8 N when the elevator is decelerating while moving downward at 2.50 m/s².
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the fluoroscopic image is brightened and reduced in size by means of the:
The fluoroscopic image is brightened and reduced in size by means of the image intensifier.
An image intensifier is a device used in fluoroscopy to enhance the visualization of X-ray images. It consists of a vacuum tube that amplifies the X-ray image and converts it into a visible light image.
When X-rays pass through the patient's body, they interact with the image intensifier's input screen, which converts the X-rays into visible light photons. These photons are then accelerated and focused onto a smaller output screen, resulting in a brighter and magnified image. The image intensifier's brightness gain and electro-optical coupling contribute to the enhanced visualization of the fluoroscopic image, making it brighter and reducing its size.
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A liquid with a density of 750 kg/m3 and a volumetric flow rate of 0.15 m3/s flows through a plastic pipe. If the head loss due to friction is 325 m, calculate the required pump power in kilowatt to maintain the flow. (take the gravitational acceleration as 9.81 m.s-2) (10 Points recommended time: 5 mins).
The required pump power to maintain the flow of a liquid with a density of 750 kg/[tex]m^3[/tex] and volumetric flow rate of 0.15 [tex]m^3[/tex]/s through a plastic pipe, considering a head loss due to friction of 325 m, is approximately 3.94 kilowatts.
The power required can be calculated using the equation:
[tex]Power = \frac{(Density * Gravity * Volumetric Flow Rate * Head Loss)}{Efficiency}[/tex]
Substituting the given values, where the density is 750 kg/[tex]m^3[/tex], gravitational acceleration is 9.81 m/[tex]s^2[/tex], volumetric flow rate is 0.15 [tex]m^3[/tex]/s, and head loss due to friction is 325 m, we can calculate the power. Assuming an efficiency of 100%, the expression simplifies to Power = (750 kg/[tex]m^3[/tex]* 9.81 m/[tex]s^2[/tex] * 0.15 [tex]m^3[/tex]/s * 325 m) / 1. After evaluating the expression, the required pump power is found to be 3,937.3125 watts. Converting this to kilowatts, we divide by 1000, yielding approximately 3.94 kilowatts as the final result.
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How much kinetic energy will an electron gain if it accelerates through a potential difference of 5000? Compute the answer in eV.
Kinetic energy gained by an electron if it accelerates through a potential difference of 5000 is equal to 5 times the potential difference in electron volts.
The equation to calculate the kinetic energy gained by an electron when it accelerates through a potential difference is:
K.E. = q * V,
where K.E. is the kinetic energy, q is the charge of the electron, and V is the potential difference.
The charge of an electron, q, is equal to the elementary charge, e, which is approximately 1.602 × 10^(-19) coulombs.
Given:
Potential difference (V) = 5000 volts.
Substituting these values into the equation:
K.E. = (1.602 × [tex]10^{(-19)[/tex] C) * (5000 V)
= 8.01 × [tex]10^{(-16)[/tex] C * V.
To convert the answer to electron volts (eV), we can use the conversion factor:
1 eV = 1.602 × [tex]10^{(-19)[/tex] J.
Therefore, the kinetic energy gained by the electron is:
K.E. = (8.01 × [tex]10^{(-16)[/tex] C * V) / (1.602 × [tex]10^{(-19)[/tex] J/eV)
= 5 * V eV.
Hence, the kinetic energy gained by the electron is equal to 5 times the potential difference in electron volts.
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(a) The thickness of an aquifer is found to be 20 m. Its hydraulic conductivity is 20 cm/ day. Calculate the transmissivity of the aquifer. () (b) A confined aquifer is 33 m thick and 7 km wide. Two observation wells are located 1.2 km apart in the direction of flow. The head in Well 1 is 97.5 m and in Well 2 it is 89.0 m. The hydraulic conductivity is 1.2 m/ day. i. What is the total daily flow through the aquifer? () ii. What is the Transmissivity of the aquifer? () (c) A confined aquifer is 35 m thick and 5 km wide. Two observation wells are located 1.5 km apart in the direction of groundwater flow. The head in well 1 is 100 m and in well 2 is 85 m. The hydraulic conductivity is 2.5 m/ day. What is the daily flow of water through the aquifer? ()
The answers to the given questions are as follows:
a) Transmissivity of the aquifer with a thickness of 20 m and hydraulic conductivity of 20 cm/day is 0.1667 m²/day.
b) i) The total daily flow through a confined aquifer with a thickness of 33 m, width of 7 km, distance between observation wells of 1.2 km, and hydraulic conductivity of 1.2 m/day is 5.25 m³/day.
ii) The transmissivity of the aquifer is 39.6 m²/day.
c) The daily flow of water through a confined aquifer with a thickness of 35 m, width of 5 km, the distance between observation wells of 1.5 km, and hydraulic conductivity of 2.5 m/day is 16.67 m³/day
(a) To calculate the transmissivity of the aquifer, we need to convert the hydraulic conductivity from cm/day to m²/day.
Given:
Thickness of the aquifer (h) = 20 m
Hydraulic conductivity (K) = 20 cm/day
Transmissivity (T) is calculated as:
T = K × h
Converting hydraulic conductivity to m/day:
K = 20 cm/day × (1 m/100 cm) × (1 day/24 hours)
= 0.008333 m/day
Substituting the values:
T = 0.008333 m/day × 20 m
= 0.1667 m²/day
Therefore, the transmissivity of the aquifer is 0.1667 m²/day.
(b) Thickness of the confined aquifer (h) = 33 m
Width of the aquifer (L) = 7 km = 7000 m
Distance between the observation wells (d) = 1.2 km = 1200 m
Head in Well 1 (h1) = 97.5 m
Head in Well 2 (h2) = 89.0 m
Hydraulic conductivity (K) = 1.2 m/day
i. To calculate the total daily flow through the aquifer, we can use Darcy's Law:
Q = K × L × (h1 - h2) / d
Substituting the given values:
Q = 1.2 m/day × 7000 m × (97.5 m - 89.0 m) / 1200 m
Q = 5.25 m³/day
ii. The transmissivity (T) of the aquifer is calculated as:
T = K × h
Substituting the given values:
T = 1.2 m/day × 33 m
= 39.6 m²/day
(c) Thickness of the confined aquifer (h) = 35 m
Width of the aquifer (L) = 5 km = 5000 m
Distance between the observation wells (d) = 1.5 km = 1500 m
Head in Well 1 (h1) = 100 m
Head in Well 2 (h2) = 85 m
Hydraulic conductivity (K) = 2.5 m/day
To calculate the daily flow of water through the aquifer, we can use Darcy's Law:
Q = K × L × (h1 - h2) / d
Substituting the given values:
Q = 2.5 m/day × 5000 m × (100 m - 85 m) / 1500 m
Q = 16.67 m³/day
Therefore, the daily flow of water through the aquifer is 16.67 m³/day.
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The charge mobility of copper is about 4.5×10 −3V/m m/s. If the voltage change across a 12 cm copper block is 1.6mV and the voltage changes at a constafit rate, what is the drift velocity of electrons across the block? (a) 0.86μm/s (b) 60μm/s (c) 140μm/s (d) 5.4 mm/s (e) 340 mm/s
Given,Charge mobility of copper =[tex]4.5×10-3Vm/m-sVoltage[/tex]change across a 12 cm copper block = 1.6 mV Drift velocity is the average velocity of the electron when it moves through the material under the influence of an external electric field.
The relation between drift velocity, current density, and charge mobility is given by the formula;v = J/Ne
Where,v = drift velocityJ = current densityN = charge densitye = charge of one electronThe current density is given by;J = I/A
Where,I = current flowing through the conductor
A = Area of cross-section of the conductorPutting the values in the above formulas;I
=[tex]VA = 1.6 × 10⁻³V × 1.2 × 10⁻⁴m²I = 1.92 × 10⁻⁷AN = Ne = \[\frac{1}{1.6 \times {{10}^{-19}}}\]N = 6.25 × 10²²[/tex]
Charge mobility,
[tex]μ = 4.5×10⁻³ Vm/m-s[/tex]
The charge density is given by;
μ = \[[tex]\frac{{{J}}}{N{e}}\]V = J/NeV = J/[/tex] (nAe)Now, the drift velocity is given by;v [tex]
= [tex]J/ 10⁻¹⁹C) × (4.5 × 10⁻³Vm/m-s[/tex]) × (1.92 × 1[tex]0⁻⁷A) / (6.25 × 10²²/m³)[/te[/tex]x] The drift velocity of the electron isv =[tex]1.86 × 10⁻⁶ m/sv = 0.86 μm/s[/tex]
Therefore, option (a) 0.86 μm/s is the correct answer.
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A dog jumps horizontally at 5.1 m/s from the deck of a steady boat, 1.8 m above the waten At what horizontal distance from the boat will the dog hit the water? 3.1 m 2.4 m 9.2 m 2.8 m 3.8 m
To find the horizontal distance from the boat where the dog will hit the water, we can use the formula for horizontal projectile motion.
1. First, let's determine the time it takes for the dog to hit the water. Since the dog jumps horizontally, the vertical motion does not affect the time. We can use the formula:
d = v * t
Where d is the vertical distance (1.8 m) and v is the initial vertical velocity (0 m/s).
Solving for t, we get:
t = d / v
t = 1.8 m / 0 m/s
t = infinity
2. Since the time is infinite, the dog will never hit the water if it jumps horizontally.
Therefore, the dog will not hit the water. None of the given options (3.1 m, 2.4 m, 9.2 m, 2.8 m, 3.8 m) are correct.
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A 1.35 kg object is floating on an air-track and is attached to a horizontal spring of force constant 2.50 N/cm. You start the object oscillating by pulling it 6.00 cm from its equilibrium position and releasing it. You observe that after eight cycles its maximum displacement from equilibrium is only 3.50 cm. How much energy is lost to damping during these eight cycles? Where did this energy go?
The energy lost to damping is 0.30 J.The energy lost to damping is primarily converted into heat.
To determine the energy lost to damping during the eight cycles, we can use the concept of mechanical energy.
The mechanical energy of the oscillating system is the sum of potential energy and kinetic energy. In the absence of damping, the total mechanical energy would remain constant over time.
Given:
Mass of the object (m) = 1.35 kg
Force constant of the spring (k) = 2.50 N/cm = 250 N/m
Initial displacement from equilibrium (x0) = 6.00 cm = 0.06 m
Maximum displacement from equilibrium (xmax) after eight cycles = 3.50 cm = 0.035 m
To calculate the total energy lost to damping during the eight cycles, we need to determine the initial mechanical energy (Einitial) and the final mechanical energy (Efinal).
The initial mechanical energy (Einitial) is given by the potential energy at the maximum displacement from equilibrium:
Einitial = (1/2) * [tex]k * x_0^2[/tex]
Einitial = (1/2) * 250 * [tex]0.06^2[/tex] = 0.45 J
The final mechanical energy (Efinal) is given by the potential energy at the maximum displacement from equilibrium after eight cycles:
Efinal = (1/2) * k * [tex]xmax^2[/tex]
Efinal = (1/2) * 250 * [tex]0.035^2[/tex] = 0.15 J
The energy lost to damping during the eight cycles is the difference between the initial and final mechanical energies:
Energy lost = Einitial - Efinal
Energy lost = 0.45 J - 0.15 J = 0.30 J
The energy lost to damping is 0.30 J.
Where did this energy go? The energy lost to damping is primarily converted into heat. Due to damping forces (such as air resistance or internal friction within the system), the mechanical energy is dissipated as heat energy, resulting in a decrease in the amplitude of the oscillations over time.
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Practica
Three point-like charged are placed at the corners of an equilateral triange as shown. Each side of the triangle is a length of 26.0 cm, and point A is located halfway between q1 and q2. What is the electric potential at point A?
Let q1 = -2.20 uC
Let q2 = +2.40 uC
Let q3 = -3.60 uC
The electric potential at point A due to three point-like charges is -2.15 volts.`
To determine the electric potential at point A due to three point-like charges, we use the formula below;
`V=kq1/r1+kq2/r2+kq3/r3`
where
V is the electric potential,
k is Coulomb's constant,
q1, q2, and q3 are the charges,
r1, r2, and r3 are the distances between point A and each charge.
The distance between points A and q1 and q2 is equal and can be calculated as below;
l = 26 cm/2 = 13 cm
Then, using the Pythagoras Theorem;
`a² + b² = c²`
where
a and b are the horizontal and vertical components of the distance between q1 and q2 while c is the distance between q1 and q2.
Thus,
`c = sqrt(a² + b²)`
Let's assume the horizontal distance between q1 and q2 is x, and the vertical distance is y.
Thus we have;
`x² + y² = 13²`
`y = sqrt(13² - x²)`
We can use trigonometry to find x, where;
`tan60 = y/x`
Therefore,
`x = y/tan60`
Substituting for y;
`x = sqrt(13² - x²)/tan60`
Solving for x gives;
`x = 7.50 cm`
Using the Pythagoras Theorem;
`r1 = sqrt(x² + 13²) = 15.00 cm`
`r2 = r1 = 15.00 cm`
`r3 = 26.00 cm`
Substituting these values into the formula above,
`V=kq1/r1+kq2/r2+kq3/r3`
Electric potential `V = -2.15 volts.`
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How many significant figures are in the following numbers? (a) 280.0 \pm 0.1 (b) 7.00 \times 10^{11} (c) 4.320 \times 10^{-10} (d) 0.0090
The number of significant figures in the given numbers are as follows: (a) 4 significant figures, (b) 3 significant figures, (c) 4 significant figures, and (d) 2 significant figures.
Significant figures are the digits in a number that carry meaningful information about its precision. The rules for determining the number of significant figures are as follows:
(a) The number 280.0 ± 0.1 has 4 significant figures. The zeros between the non-zero digits (8 and 2) are significant because they are sandwiched between significant digits, and the trailing zero (0.0) after the decimal point is also significant because it indicates the precision to the tenths place. The uncertainty ± 0.1 is considered to have one significant figure.
(b) The number 7.00 × 10^11 has 3 significant figures. The leading zeros before the non-zero digit (7) are not significant and are used to indicate the magnitude of the number. The zeros after the decimal point and between the non-zero digits (7 and 0) are significant. The exponential notation (10^11) does not affect the number of significant figures.
(c) The number 4.320 × 10^(-10) has 4 significant figures. All the digits (4, 3, 2, and 0) are non-zero and, therefore, significant. The exponential notation (10^(-10)) does not affect the number of significant figures.
(d) The number 0.0090 has 2 significant figures. The leading zeros before the non-zero digits (9 and 0) are not significant and are used to indicate the magnitude of the number. Only the non-zero digits are considered significant.
Remember that zeros can be significant or insignificant depending on their position within the number. Leading zeros before non-zero digits are not significant, trailing zeros after the decimal point and between non-zero digits are significant, and trailing zeros without a decimal point may or may not be significant depending on the context.
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A model rocket is launched on a windless day and accelerates upwards with a=25 m/s
2
for 8 seconds. After these first 8 seconds, the engine runs out of fuel and shuts down, leaving the rocket to coast under the effects of gravity. Assuming zero air friction, a) How long after the engine shutdown does it take for the rocket to stop moving upwards? b) How high does the rocket go? (from the ground) c) How long does it take the rocket to return to the ground? [Assume no parachutes exist and there is no air friction]
a) The time for which the rocket moves upwards after the engine shuts down is 20.4 s.
b) The height of the rocket from the ground is 3264 meters.
c) The time taken by the rocket to return to the ground is 80.5 seconds.
a) The upward motion of the rocket is described by v = u + at
where
u is the initial velocity,
a is the acceleration,
t is time,
v is the final velocity
Since the rocket is launched from rest,
u = 0.v = u + at
=> v = at
The velocity of the rocket when the engine shuts down,
t = 8s.
So, v = at = 25 × 8 = 200 m/s.
The rocket will continue moving upwards until its velocity becomes zero. Thus, the time for which the rocket moves upwards after the engine shuts down is given by
t = v / g
where
g is the acceleration due to gravity = 9.8 m/s²
On substituting the value of v = 200 m/s and g = 9.8 m/s², we get
t = 200 / 9.8 = 20.4 s
Therefore, the time for which the rocket moves upwards after the engine shuts down is 20.4 s.
b) The height of the rocket is given by h = ut + 1/2 at²
when the engine is running, the initial velocity of the rocket,
u = 0h = 1/2 at²
when the engine shuts down, the velocity of the rocket is 200 m/s and the time it takes for the rocket to come to rest is 20.4 s. The final velocity of the rocket, v = 0.
On substituting these values in the above equation, we get
h = 1/2 (25) (8)² + 200 (20.4) = 3264 meters
Therefore, the height of the rocket from the ground is 3264 meters.
c) Since the acceleration due to gravity acts downward on the rocket after the engine shuts down, the time taken by the rocket to return to the ground is given by
h = 1/2 gt²
On substituting the value of h = 3264 meters and g = 9.8 m/s², we get
3264 = 1/2 (9.8) t² => t = 80.5 s
Therefore, the time taken by the rocket to return to the ground is 80.5 seconds.
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When water freezes, its volume increases by 9.05% (that is, ΔV/V
0
=9.05×10
−2
). What force per unit area is water capable of exerting on a container when it freezes? (It is acceptable to use the bulk modulus of water in this problem.) (b) Is it surprising that such forces can fracture engine blocks, boulders, and the like?
The force per unit area that water is capable of exerting on a container when it freezes is 9.8 MPa. It is not surprising that such forces can fracture engine blocks, boulders etc.
This can be calculated using the following equation:
F/A = -B * (ΔV/V0)
where:
F/A is the force per unit area
B is the bulk modulus of water (2.2 × 109 Pa)
ΔV/V0 is the fractional change in volume (9.05 × 10−2)
The bulk modulus of a material is a measure of its resistance to compression. When water freezes, its volume increases by 9.05%. This means that the water is being compressed by a factor of 1 - 0.0905 = 0.9095. The force per unit area that the water exerts on the container is equal to the bulk modulus of water multiplied by the fractional change in volume.
The force per unit area of 9.8 MPa is equivalent to a pressure of 980 atmospheres. This is a very high pressure, and it is not surprising that it can fracture engine blocks, boulders, and the like.
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The coefficient of static friction is \( 0.1 \) and the coefficient of kinetic friction is \( 0.03 \). (a) Calculate the minimum force \( F \) (in N) he must exert to get the block moving. \( \mathrm{
The minimum force F required to move the block is: F = f = 5 N
The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. The minimum force F (in N) he must exert to get the block moving can be calculated using the following steps:
For a body to be in a state of equilibrium, the sum of the forces acting on it must be zero. However, if the sum of the forces acting on the body is not zero, it will be in motion. Hence, when an object is at rest and we want to move it, we need to exert a force that is greater than the maximum static friction force acting on the object.
If we consider the forces acting on the object in the horizontal direction, we can write the equation as follows:
ma = F - f
where m is the mass of the block, a is the acceleration of the block, F is the applied force, and f is the friction force. If the object is at rest, then the acceleration is zero, and we can simplify the equation as follows: F = f
Since we want to find the minimum force F required to move the block, we need to consider the maximum static friction force acting on the block, which is given by:
f = μsN
where μs is the coefficient of static friction and N is the normal force acting on the block. The normal force N is equal to the weight of the block, which is given by:
N = mg
where g is the acceleration due to gravity. Substituting this expression for N in the expression for f,
we get:
f = μsmg
Now, substituting the given values of the coefficients of friction and the mass of the block, we get:
f = 0.1 x 10 x 5
= 5 N
Therefore, the minimum force F required to move the block is: F = f = 5 N
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The coefficient of static friction between a concrete block and a surface is 0.8 and the coefficient of kinetic friction is 0.5. The block weighs 23lbf. If a horizontal force of 16.4lbf is applied to the block, would the block move? Yes No What is the magnitude of friction force (in Ibf)? Your response differs from the correct answer by more than 10%. Double check your calculations. Ibf What is the minimum magnitude of the horizontal force (in Ibf) needed to set the block in motion? × Your response differs from the correct answer by more than 10%. Double check your calculations. Ibf
Yes, the block would move with a magnitude of friction force of 12.8 lbf. The minimum magnitude of the horizontal force needed to set the block in motion is 16 lbf.
The coefficient of static friction, denoted as μs, is 0.8, and the coefficient of kinetic friction, denoted as μk, is 0.5. The block weighs 23 lbf.
To determine if the block would move when a horizontal force of 16.4 lbf is applied, we compare the applied force to the maximum static friction force. The maximum static friction force can be calculated by multiplying the coefficient of static friction (μs) by the weight of the block. In this case, the maximum static friction force would be 0.8 * 23 lbf = 18.4 lbf.
Since the applied force (16.4 lbf) is less than the maximum static friction force (18.4 lbf), the block does not move. The force of static friction acts in the opposite direction to the applied force, trying to prevent motion.
The magnitude of the friction force can be calculated using the coefficient of kinetic friction (μk) multiplied by the weight of the block. In this case, the magnitude of the friction force would be 0.5 * 23 lbf = 11.5 lbf.
To set the block in motion, the applied force needs to overcome the force of static friction. The minimum magnitude of the horizontal force required to overcome static friction is equal to the force of static friction itself. Therefore, the minimum magnitude of the horizontal force needed to set the block in motion is 11.5 lbf.
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What is the diameter of a 1.00−m length of tungsten wire whose resistance is 0.48Ω? Express your answer using two significant figures.
The diameter of the 1.00-m length of tungsten wire whose resistance is 0.48 Ω is 0.15 cm.
Resistance is the opposition of an electrical conductor to the flow of current. Resistance is proportional to the wire's length and inversely proportional to its cross-sectional area, which is proportional to the square of the wire's diameter.
According to the formula, R = ρL / A where R = resistance of the wire, L = length of the wire, ρ = resistivity of tungsten wire, A = cross-sectional area of the wire= πd²/4
Here, ρ = 5.6 × 10⁻⁸ Ω·m (resistivity of tungsten wire), L = 1.00 m, R = 0.48 Ω, π = 3.14159265
Now, the diameter of the tungsten wire can be calculated as follows:
R = ρL / A
0.48 Ω = (5.6 × 10⁻⁸ Ω·m)(1.00 m) / π(d²/4)
Solve for d to get;
d = 0.15 cm
Hence, the diameter of the 1.00-m length of tungsten wire whose resistance is 0.48 Ω is 0.15 cm.
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A person with a near-point distance of 25 cm is able to get a usable angular magnification of 11 with a particular magnifying glass. Her friend is only able to get a usable angular magnification of 6. What is the friend’s near-point distance?
The near-point distance of the person is 25 cm and usable angular magnification of 11 is given. We need to determine the near-point distance of the friend, and usable angular magnification of 6 is given. We can use the lens formula 1/v - 1/u = 1/f .
The magnification of a simple magnifying glass is given as:Magnification (m) = (1 + D/f) / Dwhere,D = Least distance of distinct vision = 25 cm (for the person), andD = To be determined (for her friend),and f is the focal length of the magnifying glass.We can find the focal length of the magnifying glass as follows:
Magnification, m = 11D
= 25 cm1 + D/f
= 11/1.25f
= D / (11D - 25)Also,Magnification, m = 6D = To be determined.1 + D/f
= 6/1.25f
= D / (6D - 25)Using the fact that both magnifying glasses are the same, their focal lengths will be equal.So, we can equate the two expressions to find D:D / (11D - 25)
= D / (6D - 25) Multiplying both sides by (11D - 25)(6D - 25),
we get:6D - 25 = 11D - 25 Solving for D, we get:D = 5 cm
Therefore, the friend’s near-point distance is 5 cm .
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answer this question, first click here to view the associated video. Asatellite is in a circular orbit around a planet. A second satellite is placed in a different circular orbit that is farther away from the same planet. How do the speeds of the two satellites compare? The speed of the second satellite is less than the speed of the first satellite. The speed of the second satellite is greater than the speed of the first satellite. The speeds of the two satellites are equal, Which of the following statements is correct concerning satellites in orbit around the same planet? The period of a satellite depends on its mass. Satellites located closer to the planet have longer periods. The period of a satellite is independent of the planet's mass. If the orbital radius of a satellite doubles, then its period increases by a factor of 4 . None of the above statements are correct.
The correct statement concerning satellites in orbit around the same planet is: "The period of a satellite is independent of the planet's mass."
The period of a satellite refers to the time it takes for the satellite to complete one full orbit around the planet. This period is determined by the radius of the orbit and the gravitational force between the satellite and the planet. It is important to note that the mass of the satellite itself does not affect its period.
The period of a satellite depends on the radius of its orbit and is governed by Kepler's Third Law of Planetary Motion. According to this law, the period of a satellite is proportional to the square root of the cube of its orbital radius. Therefore, if the orbital radius of a satellite doubles, its period increases by a factor of 2^(3/2), which is approximately 2.83. This means the period increases by a factor of 2.83, not 4.
Hence, the correct statement is that the period of a satellite is independent of the planet's mass.
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A car starting from rest drives with an acceleration of 5 m/s
2
. After driving for 20 m, it falls off a cliff 30 meters high. What it the car's velocity in vector form right when it hits the ground? What if the magnitude and direction of that vector.
The car's velocity, in vector form, when it hits the ground is approximately 14.2 m/s at an angle of 41.3 degrees downward from the horizontal.
To find the car's velocity when it hits the ground, we need to calculate the time it takes to fall from the cliff. The height of the cliff is 30 meters, and we can use the equation of motion for vertical motion:
[tex]\[ h = \frac{1}{2} g t^2 \][/tex]
where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time. Rearranging the equation to solve for t:
[tex]t = \sqrt{\frac{2h}{g}}[/tex]
Plugging in the values, we get:
[tex]\[t = \sqrt{\frac{{2 \cdot 30}}{{9.8}}} \approx 2.17 \text{ seconds.}\][/tex]
Now, we can find the velocity of the car horizontally. The car has an acceleration of 5 m/s^2 for a distance of 20 meters, so we can use the equation of motion:
v = u + at,
where v is the final velocity, u is the initial velocity (0 m/s since the car starts from rest), a is the acceleration, and t is the time. Plugging in the values, we get:
v = 0 + (5 * 2.17) ≈ 10.85 m/s.
The velocity is only horizontal at this point, and the direction is determined by the angle of the cliff. Since the car falls straight down, the direction is downward.
Finally, we combine the horizontal and vertical velocities to get the resultant velocity vector. Using the Pythagorean theorem:
[tex]\[\text{{resultant velocity}} = \sqrt{{v_{\text{{horizontal}}}^2 + v_{\text{{vertical}}}^2}} = \sqrt{{(10.85)^2 + (9.8)^2}} \approx 14.2 \, \text{{m/s}}\][/tex]
The direction of the resultant velocity vector can be found using trigonometry. The angle between the resultant velocity and the horizontal axis is given by:
[tex]\(\theta = \arctan\left(\frac{{v_{\text{{vertical}}}}}{{v_{\text{{horizontal}}}}}\right)\)\\\(\theta = \arctan\left(\frac{{9.8}}{{10.85}}\right) \approx 41.3\) degrees.[/tex]
Therefore, the car's velocity, in vector form, when it hits the ground is approximately 14.2 m/s at an angle of 41.3 degrees downward from the horizontal.
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A child is 3.40 m above the ground on a slide with no friction. What speed does the child have when he/she reaches the bottom? 3.40
The child has a speed of 8.16 m/s when he/she reaches the bottom of the slide. Potential energy = mgh where m is the mass, g is acceleration due to gravity and h is height. We know the values of h and g. The value of m is not given, so we can assume the mass of the child to be 50 kg.
Thus the potential energy can be calculated as:Potential energy = mgh = 50 × 9.8 × 3.40= 1666 J
Now let us find the kinetic energy of the child when he/she reaches the bottom.
We know that Total energy = potential energy + kinetic energy.
The total energy at the height is equal to the kinetic energy at the bottom because there is no loss of energy due to friction.
Therefore,Kinetic energy = Total energy - Potential energy
Kinetic energy = 1666 J
The formula for Kinetic energy is given as: Kinetic energy = 1/2 × m × v², where m is the mass of the object and v is its velocity.
Using this formula, we can find the velocity of the child when he/she reaches the bottom:1/2 × m × v² = Kinetic energy1/2 × 50 × v² = 1666 v² = 1666 × 2 / 50v² = 66.64v = √66.64v = 8.16 m/s
Therefore, the child has a speed of 8.16 m/s when he/she reaches the bottom of the slide.
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A 1200 kg car is going a steady 20.0 m/s down a straight stretch of highway without changing speed, what is the net force on the car?
The net force on the car is zero since it is moving at a steady speed without changing velocity. The balanced forces result in no acceleration.
Since the car is moving at a steady speed without changing its velocity, it experiences zero acceleration. According to Newton's second law of motion, the net force acting on an object is equal to its mass multiplied by its acceleration. Since the car has zero acceleration, the net force on the car is also zero. In other words, there is no additional force acting on the car to change its motion.
When the car is moving at a constant velocity, the forces acting on it are balanced. The force of friction between the car's tires and the road is equal in magnitude and opposite in direction to the force exerted by the car's engine. This balance of forces results in the car maintaining a constant speed without any acceleration.
Therefore, in this scenario, the net force on the car is zero.
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Sketch the magnitudes and phases of the CTFTs of these signals in the f form. a. x(t)=δ(t−2) b. x(t)=u(t)−u(t−1)
The CTFT (Continuous-Time Fourier Transform) of a signal provides information about its frequency content, including the magnitudes and phases of its frequency components. Let's consider the given signals and sketch their magnitudes and phases in the f form.
a. Signal x(t) = δ(t-2):
The Dirac delta function δ(t-2) is a impulse located at t = 2. The CTFT of the Dirac delta function is a constant value of 1. Therefore, the magnitude of the CTFT of x(t) will be constant and equal to 1 for all frequencies. The phase of the CTFT is zero for all frequencies.
b. Signal x(t) = u(t) - u(t-1):
Here, u(t) is the unit step function, which is 0 for t < 0 and 1 for t ≥ 0. The difference u(t) - u(t-1) results in a rectangular pulse of width 1 starting from t = 0 and ending at t = 1.
To sketch the magnitude and phase of the CTFT of x(t), we need to consider the Fourier transform properties. The CTFT of a rectangular pulse is a sinc function, which has a main lobe with a width inversely proportional to the pulse width. The magnitude of the sinc function decreases as the frequency increases, and the phase changes linearly with frequency.
Therefore, for the given signal x(t), the magnitude of the CTFT will be a sinc function, with the main lobe centered around the frequency 0, and the magnitude decreasing as the frequency increases. The phase of the CTFT will change linearly with frequency, starting from zero at the frequency 0.
In summary:
a. x(t) = δ(t-2)
- Magnitude: Constant value of 1 for all frequencies.
- Phase: Zero for all frequencies.
b. x(t) = u(t) - u(t-1)
- Magnitude: Sinc function with the main lobe centered around frequency 0 and decreasing as the frequency increases.
- Phase: Linearly changing with frequency, starting from zero at frequency 0.
Remember to sketch the magnitude and phase plots accordingly.
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An electron with mass m = 9.11 x 10 {eq}^{31} {/eq} kg is released at rest near a very large positively charged non-conducting charged sheet lying horizontally as shown.
What should the surface charge density {eq}\sigma {/eq} on this sheet be to keep the electron balanced at rest above the ground?
To keep the electron balanced and at rest above the ground, the electrical force acting on the electron due to the charged sheet must exactly counteract the gravitational force acting on the electron.
The gravitational force (F_gravity) on the electron is given by F_gravity = m * g, where m is the mass of the electron (9.11 x 10^(-31) kg) and g is the acceleration due to gravity (approximately 9.8 m/s²).
The electrical force (F_electric) on the electron due to the charged sheet is given by F_electric = E * q, where E is the electric field created by the charged sheet and q is the charge of the electron (which is -1.6 x 10^(-19) C).
Since the electron is at rest, the magnitudes of F_gravity and F_electric must be equal.
Setting F_gravity = F_electric, we have:
m * g = E * q
Rearranging the equation to solve for E:
E = (m * g) / q
Substituting the given values into the equation:
E = (9.11 x 10^(-31) kg * 9.8 m/s²) / (-1.6 x 10^(-19) C)
E ≈ -5.6 x 10^11 N/C
The electric field (E) created by the charged sheet is related to the surface charge density (σ) by the equation E = σ / (2ε₀), where ε₀ is the permittivity of free space.
Therefore, we have:
-5.6 x 10^11 N/C = σ / (2ε₀)
Rearranging the equation to solve for σ:
σ = -2ε₀ * 5.6 x 10^11 N/C
Substituting the appropriate value for ε₀, which is approximately 8.85 x 10^(-12) C²/(N·m²):
σ ≈ -2 * (8.85 x 10^(-12) C²/(N·m²)) * 5.6 x 10^11 N/C
σ ≈ -9.9 x 10^(-1) C/m²
Therefore, to keep the electron balanced and at rest above the ground, the surface charge density (σ) on the sheet should be approximately -9.9 x 10^(-1) C/m².
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A charge is distributed uniformly in the volume of a semi-sphere. Can one compute the electric field from this charge distribution using the Gauß law?
Yes, the Gauss's law can be used to compute the electric field from a charge distribution, including the case of a uniformly distributed charge in the volume of a semi-sphere. The electric field will have a radial symmetry, and its magnitude will depend on the distance from the center of the semi-sphere.
Gauss's law states that the electric flux through a closed surface is proportional to the total enclosed charge. Mathematically, it can be written as: Φ = ∮ E ⋅ dA = (1/ε₀) * Q_enclosed
Where:
Φ is the electric flux through a closed surface
E is the electric field
dA is an infinitesimal area vector on the closed surface
ε₀ is the permittivity of free space (approximately 8.85 × 10^-12 C²/(N·m²))
Q_enclosed is the total charge enclosed by the closed surface.
To compute the electric field from the charge distribution in a semi-sphere, you can consider a Gaussian surface that encloses the semi-sphere. Since the charge is uniformly distributed, the charge enclosed by the Gaussian surface will be proportional to the volume of the semi-sphere.
Once you know the charge enclosed, you can apply Gauss's law to find the electric field. By using the appropriate Gaussian surface and considering the symmetry of the charge distribution, you can apply Gauss's law to compute the electric field.
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Two electrodes are seperated by a distance of 3 centimeters. There is an electric field of 595.4 V/m between the two electrodes. What is the voltage applied between them?
2.) A charge 4.3 milliCoulomb is placed in an electric field of 842.2 V/m. Which force is applied on the charge? Express your answer in newtons.
1. The voltage applied between the electrodes is 17.86 V.2.
2. The force applied on the charge is 3.62 x 10^-3 N.
1. The electric field strength is given as 595.4 V/m, and the distance between the electrodes is given as 3 cm.
We can use the equation:V = E x d
d = 3 cm = 0.03 m. Substituting the given values in the above equation, we get:
V = 595.4 x 0.03V = 17.86 V
Therefore, the voltage applied between the electrodes is 17.86 V.2.
2.The charge on the particle is given as 4.3 mC, and the electric field strength is given as 842.2 V/m.
We can use the equation: F = q x E
F = 4.3 mC = 4.3 x 10^-3 CE = 842.2 V/m.
Substituting the given values in the above equation, we get:
F = 4.3 x 10^-3 x 842.2
F = 3.62 x 10^-3 N.
Therefore, the force applied on the charge is 3.62 x 10^-3 N.
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A cube’s length was measured with a caliper to be 2.65 cm and the mass of the cube is 61.70 g.
a) How many significant figures you get when you read with this caliper?
b) Calculate the volume of the cube in m3. Specify the number of the significant figures.
c) What is the density of the cube in kg/m3? Show your work. How many significant figures you should
have in your answer?
Therefore, the density of the cube is[tex]ρ = 3.4 × 10^6 g/m^3[/tex](rounded to two significant figures)To express this density in kilograms per cubic meter (kg/m^3), we need to divide by 1000 (the conversion factor between grams and kilograms)
[tex]ρ = 3.4 × 10^6 g/m^3 ÷ 1000ρ = 3400 kg/m^3[/tex] (rounded to two significant figures)
a) 2 significant figures
b) Volume of the cube is 0.00001814 m^3 (2 significant figures)
c) The density of the cube is 3400 kg/m^3 (2 significant figures).
a) The caliper measures to two decimal places, so there are two significant figures in the length measurement of 2.65 cm.
b) The volume of a cube is calculated using the formula V = s^3, where s is the length of one of the sides of the cube. In this case, the length of the cube is 2.65 cm, so the volume can be calculated as:
[tex]V = s^3V = (2.65 cm)^3V = 18.14 cm^3[/tex]To convert cubic centimeters (cm^3) to cubic meters (m^3), we need to divide by 1,000,000 (10^6).
So the volume of the cube in m^3 is:
[tex]V = 18.14 cm^3 ÷ 1,000,000V = 0.00001814 m^3[/tex]The volume of the cube has two significant figures (the length measurement had two significant figures).
c) Density is defined as mass per unit volume. The mass of the cube is given as 61.70 g and the volume of the cube is 0.00001814 m^3. So the density can be calculated as:
[tex]ρ = m/Vρ = 61.70 g ÷ 0.00001814 m^3ρ = 3,397,793.99 g/m^3[/tex] (this is the exact answer, but it has too many significant figures)To express this result with the correct number of significant figures, we need to look at the number with the fewest significant figures in the problem.
That number is 2.65 cm, which has two significant figures. Therefore, the answer must be rounded to two significant figures. Since the third significant figure is greater than 5, we must round up.
Therefore, the density of the cube is:
[tex]ρ = 3.4 × 10^6 g/m^3[/tex](rounded to two significant figures)To express this density in kilograms per cubic meter (kg/m^3), we need to divide by 1000 (the conversion factor between grams and kilograms):
[tex]ρ = 3.4 × 10^6 g/m^3 ÷ 1000ρ = 3400 kg/m^3[/tex] (rounded to two significant figures)
a) 2 significant figures
b) Volume of the cube is 0.00001814 m^3 (2 significant figures)
c) The density of the cube is 3400 kg/m^3 (2 significant figures).
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A shol-pumer throws the 'shor (mass =7.3 kg ) with an intiai speed of 14.9 m/s at a 34.0 angle to the torieontal, Cavoulate the horizontal detance traveled by the shot it it leaves the athlotes hand at a height of 2.00 m above the ground. Express your answer using three significant figures and include the appropsiate units.
The horizontal distance traveled by the shot, when it leaves the athlete's hand at a height of 2.00 m, is approximately 23.6 m.
To calculate the horizontal distance traveled by the shot, we can use the projectile motion equations.
The horizontal distance can be found using the formula:
d = (v_i * t * cos(θ))
Where:
d is the horizontal distance
v_i is the initial velocity (14.9 m/s)
t is the time of flight
θ is the launch angle (34.0 degrees)
First, we need to find the time of flight. The time it takes for the shot to reach its maximum height can be calculated using the formula:
t_max = (v_i * sin(θ)) / g
Where g is the acceleration due to gravity (approximately 9.8 m/s^2).
Substituting the known values:
t_max = (14.9 m/s * sin(34.0 degrees)) / 9.8 m/s^2
Next, we can find the total time of flight by doubling the time it takes to reach the maximum height:
t_total = 2 * t_max
Now, we can substitute the values into the horizontal distance formula:
d = (14.9 m/s * t_total * cos(34.0 degrees))
Calculating the result:
d ≈ 23.6 m
Therefore, the horizontal distance traveled by the shot, when it leaves the athlete's hand at a height of 2.00 m above the ground, is approximately 23.6 m.
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Two objects, A and B, are thrown up at the same moment of time from the same level (from the ground). Object A has initial velocity 11.8 m/s; object B has initial velocity 16.1 m/s. How high above the ground is object B at the moment when object A hits the ground?
Object A is thrown at the angle 30 degrees to horizontal with initial velocity 14.4 m/s. Object B is thrown at the angle 60 degrees to horizontal 21.5 m/s. What is the ratio of heights Hb/Ha these objects will reach in this flight?
Object A is thrown at the angle 30 degrees to horizontal with initial velocity 14.4 m/s. Object B is thrown at the angle 60 degrees to horizontal 21.3 m/s. What is the ratio of horizontal ranges Db/Da these objects will cover in this flight?
The pilot of an airplane traveling with constant velocity 194 m/s wants to drop supplies to the expedition isolated on a patch of land 221 below surrounded by the water, so supplies should be dropped straight to the camp. What should be the distance between plane and the camp at the moment of releasing of supplies? Hint: this question is about total distance.
Object B will be approximately 10.9 meters above the ground when object A hits the ground. The ratio of the heights reached by objects A and B will be 2:1. The ratio of the horizontal ranges covered by objects A and B will depend on the time of flight and cannot be determined without additional information. The distance between the airplane and the camp at the moment of releasing supplies will be approximately 418.8 meters.
To determine the height of object B when object A hits the ground, we need to calculate the time of flight for both objects. Using the equations of motion, we find that the time of flight for object A is approximately 1.39 seconds, and for object B, it is approximately 1.63 seconds. Considering object B's initial velocity of 16.1 m/s, we can calculate the height it reaches using the equation: height = (initial velocity * time) - (0.5 * acceleration * [tex]time^2[/tex]). Plugging in the values, we find that object B reaches a height of approximately 10.9 meters above the ground when object A hits the ground.
The ratio of the heights reached by objects A and B can be determined by dividing their respective heights. The height reached by object A can be calculated using the same equation as above, considering its initial velocity of 11.8 m/s and time of flight of 1.39 seconds. The ratio of heights Hb/Ha is approximately 2:1.
To determine the ratio of horizontal ranges covered by objects A and B, we would need to know the respective angles of projection and the time of flight for each object. Without this information, we cannot calculate the ratio.
For the distance between the airplane and the camp at the moment of releasing supplies, we can use the concept of relative velocity. Since the airplane is traveling with a constant velocity and wants to drop supplies straight to the camp, the horizontal distance between them should be equal to the horizontal distance traveled by the airplane during the time it takes for the supplies to reach the ground. This time is determined by the height of the camp and the acceleration due to gravity. Using the equation for distance traveled, distance = velocity * time, we can calculate the distance to be approximately 418.8 meters, assuming the acceleration due to gravity is 9.8 [tex]m/s^2[/tex].
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Q4: An open belt running over two pulleys 240 mm and 600 mm diameters. The power to be transmitted is 4 KW from the smallest pulley that rotates at 300 rpm. Coefficient of friction is 0.3. Find the tensions in tight and slack sides.
The tensions in the tight and slack sides of the belt drive are calculated as follows:
Tension in the tight side: 321.8 N
Tension in the slack side: 108.7 N
The power to be transmitted is 4 KW from the smallest pulley that rotates at 300 rpm, while an open belt is running over two pulleys 240 mm and 600 mm diameters and the coefficient of friction is 0.3. This question requires the calculation of the tensions in tight and slack sides.
Step 1: Calculation of linear velocity and effective diameter of pulleys
Velocity ratio of the belt drive
[tex]\[V.R=\frac{N_1}{N_2}=\frac{D_2}{D_1}=\frac{600}{240}=2.5\][/tex]
Linear velocity of the belt drive on 240 mm diameter pulley
[tex]\[v=\frac{\pi DN}{60}=\frac{\pi \times 240 \times 300}{60}=37.7 \ \text{m}/\text{s}\][/tex]
Effective diameter of the driven pulley
[tex]\[D_2'=\frac{D_2-D_1V.R}{1-V.R}=\frac{600-240\times 2.5}{1-2.5}=684\text{mm}\][/tex]
Step 2: Calculation of tension in the slack side
Let [tex]\(T_1\) and \(T_2\)[/tex] be the tensions in tight and slack sides, respectively.
The ratio of tensions in the belt drive is given as
[tex]\[T_1/T_2=e^{\mu \theta} \cdots (1)\][/tex]
Where [tex]\(\mu\)[/tex] is the coefficient of friction and[tex]\(\theta\)[/tex] is the angle of lap in radians on the smaller pulley.
[tex]\(\theta = \text{Angle of lap in radians} = 2.5 \times \pi = 7.854 \, \text{rad}\).[/tex]
Substituting the given values in equation (1),
[tex]\[\frac{T_1}{T_2}=e^{0.3\times7.854}=2.96\][/tex]
Total tension on the belt
[tex]\[T=T_1+T_2\][/tex]
Power transmitted by the belt
[tex]\[P=\frac{T_1-T_2}{2}v \cdots (2)\][/tex]
Substituting the given values in equation (2), we get
[tex]\[4000=\frac{T_1-T_2}{2}\times 37.7\] \[T_1-T_2=212.6 \cdots (3)\][/tex]
Solving equations (1) and (3), we get the tension in slack side
[tex]\[T_2=\frac{T_1}{2.96}\][/tex]
Substituting the value of [tex]\(T_2\)[/tex] in equation (3), we get
[tex]\[T_1-\frac{T_1}{2.96}=212.6\]\[T_1=\frac{212.6\times 2.96}{1.96}=321.8\text{N}\][/tex]
Therefore, the tensions in tight and slack sides are 321.8 N and 108.7 N respectively.
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Convert the following while loops into for loops i. int i=1 while (i<=10) \{ if (i<5&&i!=2) cout<< "X"; i++; \} ii. int i=1 while (i<=10) { cout<<" X" i=i+3; \} c) Using flow charts and syntaxes only, identify and explain the EV(5) i. Difference between the do while and the while loop control structures or block ii. Similarities between the cascaded if statement and the switch statement
The first while loop can be converted into a for loop as follows:
for (int i = 1; i <= 10; i++) {
if (i < 5 && i != 2)
cout << "X";
}
How to explain the informationThe second while loop can be converted into a for loop as follows:
for (int i = 1; i <= 10; i += 3) {
cout << "X";
}
A while loop checks the condition before executing the loop body, while a do-while loop executes the loop body first and then checks the condition.
Execution: In a while loop, if the condition is false initially, the loop body will not be executed at all. In a do-while loop, the loop body is guaranteed to be executed at least once, regardless of the condition.
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A car travels at a uniform acceleration from rest. After 2.0 minutes the car has hit the 10.0 m mark on it's journey and at that point begins to uniformly accelerate at 2.0 m/s
2
. What is the velocity of the car at the 90.0 m mark of the journey?
At first, we have to calculate the velocity of the car after 2.0 minutes and after that, we can calculate the velocity at the 90.0 m mark of the journey.It is given that a car travels at uniform acceleration from rest, So u = 0 (initial velocity).
We know that,v = u + atAlso, s = ut + (1/2)at^2where,v = final velocityt = time taken to reach that velocitya = accelerationand s = distancet = 2.0 minutes = 2.0 × 60 seconds = 120 secondsLet's calculate the velocity of the car after 2.0 minutes, v1:v1 = u + atv1 = 0 + a × tv1 = a × t --- equation (1)Again, when the car hits the 10.0 m mark, it begins to accelerate uniformly at 2.0 m/s^2.
Let's find the time taken to cover 10.0 m, using equation of motion,v^2 = u^2 + 2aswhere u = 0 (initial velocity), a = 2.0 m/s^2, s = 10.0 mv^2 = 2asv^2 = 2 × 2.0 × 10.0v^2 = 40.0v = √40.0v = 2√10.0 m/sLet's calculate the time taken, t1:t1 = (v - u) / at1 = v / at1 = (2√10.0) / 2.0t1 = √10.0 sSo, the total time taken to cover 10.0 m, t = t1 + 120 t = √10.0 + 120The distance covered after 10.0 m, s = 90.0 - 10.0 = 80.0 mLet's calculate the velocity of the car at 90.0 m mark using equation (1):v1 = a × tv1 = a(t - √10.0).
Now, using the first equation of motion,v2 = v1 + at2v2 = a(t - √10.0) + at2v2 = a(t - √10.0 + t2)On integrating the equation of motion, v = u + atWe get,s = ut + (1/2)at^2Now,v = u + at --- equation (2)By substituting the value of t in equation (2), we get the value of v.Using equation (2), v2 = a(t - √10.0 + t2)Let's find t2:v = u + atwhere, v = 0 (final velocity), u = v1 = a(t - √10.0) and a = 2.0 m/s^2v = a(t - √10.0)0 = 2.0(t - √10.0)t - √10.0 = 0t = √10.0Therefore, t2 = t - √10.0t2 = √10.0 + 120 - √10.0t2 = 120 seconds.
Finally, the velocity of the car at the 90.0 m mark of the journey,v2 = a(t - √10.0 + t2)v2 = 2.0 (120 - √10.0 + 120)v2 = 480 - 2√100v2 = 480 - 20v2 = 460 m/s.
Given,a car travels at a uniform acceleration from rest. After 2.0 minutes the car has hit the 10.0 m mark on it's journey and at that point begins to uniformly accelerate at 2.0 m/s2. We have to find out the velocity of the car at the 90.0 m mark of the journey. We can find it by calculating the velocity of the car after 2.0 minutes and then after that we will calculate the velocity at the 90.0 m mark of the journey. At first, we have to calculate the velocity of the car after 2.0 minutes and after that, we can calculate the velocity at the 90.0 m mark of the journey. It is given that a car travels at uniform acceleration from rest, So u = 0 (initial velocity) We know that,v = u + atAlso, s = ut + (1/2)at2where,v = final velocityt = time taken to reach that velocitya = accelerationand s = distance t = 2.0 minutes = 2.0 × 60 seconds = 120 seconds.
Let's calculate the velocity of the car after 2.0 minutes, v1:v1 = u + atv1 = 0 + a × tv1 = a × t --- equation (1)Again, when the car hits the 10.0 m mark, it begins to accelerate uniformly at 2.0 m/s2. Let's find the time taken to cover 10.0 m, using the equation of motion,v2 = u2 + 2aswhere u = 0 (initial velocity), a = 2.0 m/s2, s = 10.0 mv2 = 2asv2 = 2 × 2.0 × 10.0v2 = 40.0v2 = √40.0v2 = 2√10.0 m/s.
Let's calculate the time taken, t1:t1 = (v - u) / at1 = v / at1 = (2√10.0) / 2.0t1 = √10.0 sSo, the total time taken to cover 10.0 m, t = t1 + 120t = √10.0 + 120The distance covered after 10.0 m, s = 90.0 - 10.0 = 80.0 mLet's calculate the velocity of the car at 90.0 m mark using equation (1):v1 = a × tv1 = a(t - √10.0)Now, using the first equation of motion,v2 = v1 + at2v2 = a(t - √10.0) + at2v2 = a(t - √10.0 + t2)On integrating the equation of motion, v = u + atWe get,s = ut + (1/2)at2Now,v = u + at --- equation (2).
By substituting the value of t in equation (2), we get the value of v.Using equation (2), v2 = a(t - √10.0 + t2)v2 = 2.0 (120 - √10.0 + 120)v2 = 480 - 2√100v2 = 480 - 20v2 = 460 m/sThus, the velocity of the car at the 90.0 m mark of the journey is 460 m/s.
The velocity of the car after 2.0 minutes is a × t = 2.0 × 2.0 = 4.0 m/s.The velocity of the car at 90.0 m mark of the journey is 460 m/s.
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