(a)
(i) To find the net force acting on the rocket in the first second, we can use Newton's second law of motion, which states that the net force (F_net) acting on an object is equal to the product of its mass (m) and acceleration (a): F_net = m * a.
In this case, the mass of the rocket is 2 kg and the acceleration is the change in velocity per unit time. Since 0.5 kg of water is ejected at 10 m/s in the first second, the change in velocity (Δv) is 10 m/s. Therefore, the acceleration (a) can be calculated as:
a = Δv / Δt = 10 m/s / 1 s = 10 m/s²
Now we can calculate the net force:
F_net = m * a = 2 kg * 10 m/s² = 20 N
Therefore, the net force acting on the rocket in the first second is 20 N.
(ii) The velocity of the rocket after launching for 1 second can be determined by using the equation:
v = u + at
where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
Since the rocket starts from rest (u = 0) and the acceleration (a) is 10 m/s², we have:
v = 0 + (10 m/s²)(1 s) = 10 m/s
Therefore, the velocity of the rocket after launching for 1 second is 10 m/s.
(b) If the rocket is placed vertically, it cannot fly up into the air because the force of gravity acts in the downward direction and the rocket does not generate enough upward thrust to overcome the gravitational force.
To modify the rocket and enable it to launch into the air, it needs a means of generating additional upward thrust. This can be achieved by adding a nozzle or a mechanism that expels high-pressure gas or air in the opposite direction of the desired upward motion. By expelling gas or air at high speed, the rocket experiences a reaction force in the upward direction according to Newton's third law of motion.
This modification allows the rocket to produce a force greater than the force of gravity, resulting in upward acceleration and launching the rocket into the air. The expelled gas or air creates a thrust force that propels the rocket upward, overcoming the gravitational force acting on it.
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How many turns would be needed to make a 1mH inductor with the following specifications: 18 AWG magnet wire (diameter of 1.02 mm ) 2 cm cclil diameter Air filled (ur=1) 140 153 161 175
To calculate the number of turns needed to make a 1mH inductor with the given specifications, we can use the formula:
L = (n^2 x d^2 x ur x A) / (18 x 10^10)
where:
L = inductance in Henrys (1mH in this case)
n = number of turns
d = wire diameter in meters (1.02 mm = 0.00102 m)
ur = relative permeability (1 for air)
A = cross-sectional area of the coil in square meters (π x r^2, where r is the radius of the coil)
First, let's find the cross-sectional area of the coil. The coil diameter is given as 2 cm, which means the radius is 1 cm or 0.01 m. Therefore, the cross-sectional area (A) is π x (0.01)^2.
Next, let's substitute the given values into the formula and solve for n:
1 x 10^(-3) = (n^2 x (0.00102)^2 x 1 x π x (0.01)^2) / (18 x 10^10)
Simplifying the equation:
1 x 10^(-3) = (n^2 x 1.0404 x 10^(-6) x 3.1416 x 10^(-4)) / (18 x 10^10)
Multiplying both sides by (18 x 10^10):
18 x 10^7 = n^2 x 1.0404 x 3.1416 x 10^(-6)
Dividing both sides by (1.0404 x 3.1416 x 10^(-6)):
n^2 = 18 x 10^7 / (1.0404 x 3.1416 x 10^(-6))
Taking the square root of both sides:
n = √(18 x 10^7 / (1.0404 x 3.1416 x 10^(-6)))
Evaluating the expression:
n ≈ 153.78
Therefore, approximately 154 turns would be needed to make a 1mH inductor with the given specifications.
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A skydiver jumps out of an airplane. What happens to her acceleration after her jump? Include air resistance. Mark the two correct answers. When she reaches terminal velocity, her acceleration becomes constant. Before she reaches terminal velocity, her velocity increases. Before she reaches terminal velocity, her acceleration remains constant. Before she reaches terminal velocity, her velocity decreases.
The correct answers are 1. When she reaches terminal velocity, her acceleration becomes constant and 4. Before she reaches terminal velocity, her velocity decreases.
When a skydiver jumps out of an aeroplane, her acceleration initially increases due to the force of gravity. However, as she falls, the opposing force of air resistance gradually becomes stronger. At a certain point, the force of air resistance equals the force of gravity, resulting in a net force of zero. This is known as terminal velocity.
At terminal velocity, the skydiver's acceleration becomes constant because the net force acting on her is zero. This means that her velocity no longer increases or decreases, and she falls at a constant speed. Therefore, statement 1 is correct: when she reaches terminal velocity, her acceleration becomes constant.
Before reaching terminal velocity, the force of gravity is stronger than the force of air resistance. As a result, the skydiver's velocity continues to increase. However, as the force of air resistance increases, it eventually equals the force of gravity. At this point, the net force becomes zero, and the skydiver's velocity stops increasing. In fact, her velocity starts to decrease because the force of air resistance now exceeds the force of gravity. Hence, statement 4 is also correct: before reaching terminal velocity, her velocity decreases.
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Two narrow slits 50μm apart are illuminated with light of wavelength 620 nm. The light shines on a screen 1.2 m distant. What is the angle of the m=2 bright fringe? Express your answer in radians. \ Incorrect; Try Again; 19 attempts remaining Part B How far is this fringe from the center of the pattern? Express your answer with the appropriate units. X Incorrect; Try Again; 19 attempts remaining
The distance of the m=2 bright fringe from the center of the pattern is approximately 0.1488 meters.
To find the angle of the m=2 bright fringe in a double-slit interference pattern, we can use the formula:
sin(theta) = m * (lambda) / d
where theta is the angle of the fringe, m is the order of the fringe, lambda is the wavelength of the light, and d is the distance between the slits.
Given that the distance between the slits is 50 μm (50 x 10^(-6) m) and the wavelength of the light is 620 nm (620 x 10^(-9) m), and we want to find the angle of the m=2 bright fringe.
Plugging the values into the formula:
sin(theta) = 2 * (620 x 10^(-9) m) / (50 x 10^(-6) m)
Now we can solve for theta by taking the inverse sine (sin^(-1)) of both sides:
theta = sin^(-1)[2 * (620 x 10^(-9) m) / (50 x 10^(-6) m)]
Calculating the value using a calculator:
theta ≈ 0.248 radians
So the angle of the m=2 bright fringe is approximately 0.248 radians.
For Part B, to find the distance of this fringe from the center of the pattern, we can use the formula:
y = m * (lambda) * L / d
where y is the distance from the center, m is the order of the fringe, lambda is the wavelength of the light, L is the distance from the slits to the screen, and d is the distance between the slits.
Given that the distance from the slits to the screen is 1.2 m, and we want to find the distance of the m=2 bright fringe.
Plugging the values into the formula:
y = 2 * (620 x 10^(-9) m) * (1.2 m) / (50 x 10^(-6) m)
Calculating the value:
y ≈ 0.1488 m
So the distance of the m=2 bright fringe from the center of the pattern is approximately 0.1488 meters.
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Bubba drops a rock down a well. The rock hits the water at the bottom of the well after 2.06 seconds. (Ignore air resistance.) A) How deep is the well? B) How fast is the rock moving when it reaches the bottom of the well?
Bubba drops a rock down a well.The rock hits the water at the bottom of the well after 2.06 seconds. (Ignore air resistance.)We have to calculate:A) How deep is the well?B) How fast is the rock moving when it reaches the bottom of the well.
The velocity of the rock at any time t is given by:v(t) = g * t where, g = 9.8 m/s² (acceleration due to gravity)When the rock reaches the water at the bottom of the well, the distance it travels is equal to the depth of the well. The distance traveled by the rock is given by:s(t) = (1/2) * g * t²We know the time it takes for the rock to hit the water,
so we can find the depth of the well by plugging in the time into the equation for distance:s(2.06) = (1/2) * 9.8 * (2.06)²s(2.06) = 21.16 mTherefore, the depth of the well is 21.16 meters.To find the velocity of the rock when it hits the water, we can use the formula:v(t) = g * tWe know the acceleration due to gravity, and we know the time it takes for the rock to hit the water:v(2.06) = 9.8 * 2.06v(2.06) = 20.17 m/sTherefore, the velocity of the rock when it hits the water is 20.17 m/s.
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A ball is thrown vertically upward with a speed of 10.0 m/s. (a) How high does it rise? Your response differs from the correct answer by more than 10%. Double check your calculations. m (b) How long does it take to reach its highest point? 24. Your response differs from the correct answer by more than 10%. Double check your calculations. s (c) How long does the ball take to hit the ground after it reaches its highest point? सh Your response differs from the correct answer by more than 10%. Double check your calculations. s (d) What is its velocity when it returns to the level from which it started? 2f Your response differs from the correct answer by miore than 10%. Double check your calculations. m/s
(a) The ball rises to a height of approximately 5.10 meters.
(b) It takes approximately 1.02 seconds for the ball to reach its highest point.
(c) After reaching its highest point, it takes approximately 2.04 seconds for the ball to hit the ground.
(d) The velocity of the ball when it returns to the level from which it started is approximately -10.0 m/s.
To solve this problem, we can use the equations of motion for vertical motion.
Initial velocity (Vi) = 10.0 m/s
Acceleration due to gravity (g) = -9.8 m/s² (negative sign indicates downward direction)
(a) To find the height the ball rises to, we can use the equation:
Vf² = Vi² + 2ad
where Vf is the final velocity (0 m/s at the highest point), Vi is the initial velocity, a is the acceleration due to gravity, and d is the displacement.
0 m/s = (10.0 m/s)² + 2(-9.8 m/s²)d
0 = 100.0 m²/s² - 19.6 m/s² d
19.6 m/s² d = 100.0 m²/s²
d ≈ 5.10 m
Therefore, the ball rises to approximately 5.10 meters.
(b) The time it takes for the ball to reach its highest point can be found using the equation:
Vf = Vi + at
At the highest point, the final velocity is 0 m/s, so we have:
0 m/s = 10.0 m/s + (-9.8 m/s²) t
-10.0 m/s = -9.8 m/s² t
t ≈ 1.02 s
Therefore, it takes approximately 1.02 seconds to reach the highest point.
(c) The total time for the ball to hit the ground after reaching its highest point is twice the time to reach the highest point since the upward and downward journeys are symmetrical:
Total time = 2 * time to reach the highest point
Total time ≈ 2 * 1.02 s
Total time ≈ 2.04 s
Therefore, it takes approximately 2.04 seconds for the ball to hit the ground after reaching its highest point.
(d) The velocity of the ball when it returns to the level from which it started is equal in magnitude but opposite in direction to the initial velocity:
Velocity = -10.0 m/s
Therefore, the velocity of the ball when it returns to the level from which it started is -10.0 m/s.
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A cable exerts a constant upward tension of magnitude $1.15 \times 10^4 \mathrm{~N}$ on a $1.13 \times 10^3 \mathrm{~kg}$ elevator as it rises through a vertical distance of $62.0 \mathrm{~m}$.
(a) Find the work done by the tension force on the elevator
(b) Find the work done by gravity on the elevator
Work done by tension force is 4.80×10⁶ J and the work done by gravity on the elevator is 6.96×10⁵ J.
A. The work done by the tension force on the elevator can be determined by calculating the change in kinetic energy of the elevator.
This is because the tension force is in the same direction as the displacement of the elevator, so it does positive work on the elevator.
The work-energy principle states that the work done on an object is equal to the change in its kinetic energy.
Thus, we can write:
Work done by tension force = Change in kinetic energy of elevator
The initial kinetic energy of the elevator is zero, since it starts from rest.
The final kinetic energy of the elevator can be calculated using the equation:
K.E. = 1/2 mv^2
where m is the mass of the elevator and v is its final velocity.
We can use the equation of motion:
v^2 = u^2 + 2as
where u is the initial velocity (zero),
a is the acceleration, and
s is the displacement.
We can solve for a to get:
a = v^2/2s
Substituting the given values, we get:
a = (2(62)/(1.13×10³)) m/s²
a = 0.979 m/s²
Substituting this value of acceleration into the equation of motion,
we get:
v^2 = 2as
v^2 = 2(0.979)(62)
v = 27.8 m/s
Substituting the values of mass and final velocity into the equation for kinetic energy,
we get:
K.E. = 1/2(1.13×10³)(27.8)
K.E. = 4.80×10⁶ J
Thus, the work done by the tension force is:
Work done by tension force = K.E. - 0
Work done by tension force = 4.80×10⁶ J
B. The work done by gravity on the elevator can be determined using the equation:
Work done by gravity = mgh
where m is the mass of the elevator,
g is the acceleration due to gravity, and
h is the vertical distance through which the elevator rises.
Substituting the given values, we get:
Work done by gravity = (1.13×10³)(9.81)(62.0)
Work done by gravity = 6.96×10⁵ J
Thus, the work done by gravity on the elevator is 6.96×10⁵ J.
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CONSERVATION OF ENERGY. Calculate the final velocity (at the ground, h=0) the chandelier would have if the rope used to hang it suddenly broke, and the chandelier plummets to the ground. (mass of the chandelier 18kg, height from the ground 6ft)
The final velocity of the chandelier when it hits the ground would be approximately 9.8 m/s.
To calculate the final velocity of the chandelier, we can use the principle of conservation of energy. The potential energy of the chandelier at its initial height can be calculated using the formula PE = mgh,
where m is the mass (18 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the height (6 ft = 1.83 m). The potential energy at the initial height is converted entirely into kinetic energy at ground level, given by KE = 0.5mv^2.
By equating the potential energy and kinetic energy and solving for v, we find that the final velocity of the chandelier is approximately 9.8 m/s.
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In photoelectric effect, the stopping potential value is 0.6 V when the light source is kept at a distance of 10 cm. When the source is kept at 20 cm away, the stopping potential will be A) 0.6 V B) 0.3 V C) 1.2 V D) 2.4 V
In the photoelectric effect, the stopping potential value is 0.6 V when the light source is placed at a distance of 10 cm. When the source is moved to a distance of 20 cm, the stopping potential will be 0.3 V. Therefore the correct option is B) 0.3 V.
The stopping potential in the photoelectric effect is determined by the energy of the incident photons and the work function of the material. The stopping potential depends on the intensity of the incident light, which is inversely proportional to the square of the distance from the source.
Given that the stopping potential is 0.6 V when the light source is 10 cm away, we can use the inverse square law to determine the stopping potential when the source is 20 cm away.
Let's denote the stopping potential when the source is 20 cm away as V'.
According to the inverse square law, the intensity of the light at a distance of 20 cm would be (10 cm / 20 cm)^2 = 0.25 times the intensity at 10 cm.
Since the stopping potential is directly proportional to the intensity of the incident light, the stopping potential when the source is 20 cm away would also be 0.25 times the stopping potential at 10 cm.
0.25 * 0.6 V = 0.15 V
Therefore, the stopping potential when the source is kept at 20 cm away would be 0.15 V.
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A highway curve of radius 591.21 m is designed for traffic moving at a speed of 71.09 km/h. What is the correct banking angle of the road?
The correct banking angle of the road is approximately 3.85 degrees.
The correct banking angle of a road can be determined using the equation:
θ = arctan((v^2 / (r * g)))
where:
θ is the banking angle of the road,
v is the velocity of the vehicle,
r is the radius of the curve, and
g is the acceleration due to gravity.
Let's plug in the given values:
v = 71.09 km/h = 19.74 m/s (converted to m/s)
r = 591.21 m
g = 9.8 m/s²
θ = arctan((19.74^2 / (591.21 * 9.8)))
Calculating the expression:
θ = arctan(0.067092)
Now, evaluating the arctan:
θ ≈ 0.0672 radians
To convert this angle to degrees, we can multiply it by the conversion factor:
θ ≈ 0.0672 * (180/π)
θ ≈ 3.85 degrees
Therefore, the correct banking angle of the road is approximately 3.85 degrees.
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in fast-pitch softball, a pitcher might use a "windmill" motion in which she moves her hand through a circular arc to pitch a ball at 70 mph. The 0.19 kg ball is 50cm from the pivot point at her shoulder and the ball reaches its maximum speed at the lowest point of the circular arc. at the bottom of the circle, just before the ball leaves her hand, what is it centripetal acceleration? what are the magnitude and direction of the force her hand exerts on the ball at this point? please show all work
The centripetal acceleration of the ball is 1960.8 m/s².2.
The magnitude of the force her hand exerts on the ball at this point is 372.352 N. The direction of this force is towards the center of the circle
Given values:
Speed of the ball = 70 mph = 31.2928 m/s
Mass of the ball = 0.19 kg
Radius of the circle = 50 cm = 0.5 m1.
Find the centripetal acceleration of the ball.
The centripetal acceleration is given by the formula:
ac = v²/r
where
ac = centripetal acceleration
v = velocity
r = radius of the circle
Substitute the given values, we get:
ac = (31.2928 m/s)²/(0.5 m)ac = 1960.8 m/s²
Therefore, the centripetal acceleration of the ball is 1960.8 m/s²
Find the magnitude and direction of the force her hand exerts on the ball at this point.
The force her hand exerts on the ball is the centripetal force. It is given by the formula:
F = mac
where
F = force applied
m = mass of the ball
a = centripetal acceleration
Substitute the given values, we get:
F = (0.19 kg)(1960.8 m/s²)F = 372.352 N
The magnitude of the force her hand exerts on the ball at this point is 372.352 N. The direction of this force is towards the center of the circle.
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This problem checks that you can use the formula that gives the electric field due to a spherical shell of charge. This formula can be calculated using the superposition principle we discussed in class and gives
E
=
4πϵ
0
1
r
2
Q
r
^
outside the shell and zero inside the shell. The distance r is the distance between the center of the shell and the point of interest. Consider a sphere with radius 4 cm having a uniformly distributed surface charge of +25nC. What is the magnitude of the electric field it creates at a point 6 cm from its center, in units of kN/C ?
A sphere with radius 4 cm having a uniformly distributed surface charge of +25nC. Its magnitude will be approximately 1.48 × [tex]10^7[/tex] N/C.
To find the magnitude of the electric field created by the spherical shell at a point outside the shell, we can use the formula you mentioned:
E = (1 / (4πε₀)) * (Q / [tex]r^2[/tex])
where:
E is the electric field,
ε₀ is the permittivity of free space,
Q is the charge of the spherical shell, and
r is the distance between the center of the shell and the point of interest.
Given:
Radius of the sphere, R = 4 cm = 0.04 m
Surface charge density, σ = +25 nC (uniformly distributed over the surface of the sphere)
To calculate the magnitude of the electric field at a point 6 cm from the center of the sphere, we need to find the total charge Q of the sphere. The charge Q can be obtained by multiplying the surface charge density σ by the surface area of the sphere.
Surface area of the sphere, A = 4π[tex]r^2[/tex]
Substituting the given values:
A = 4π[tex](0.04)^2[/tex]
A = 0.0201 π [tex]m^2[/tex]
Total charge, Q = σ * A
Q = (25 × [tex]10^{(-9)[/tex]) * (0.0201 π)
Q ≈ 1.575 × [tex]10^{(-9)[/tex]C
Now we can calculate the electric field using the formula:
E = (1 / (4πε₀)) * (Q / [tex]r^2[/tex])
Substituting the values:
E = (1 / (4π(8.85 × [tex]10^{(-12)[/tex]))) * (1.575 × [tex]10^{(-9)[/tex] / [tex](0.06)^2[/tex])
E ≈ 1.48 × [tex]10^7[/tex] N/C
Therefore, the magnitude of the electric field created by the spherical shell at a point 6 cm from its center is approximately 1.48 × [tex]10^7[/tex] N/C (kilonewtons per coulomb).
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a) In outer space, far from other objects, block 1 of mass 37 kg is at position (4,11,0)m, and block 2 of mass 1140 kg is at position ⟨22,11,0⟩m. What is the (vector) gravitational force acting on block 2 due to block 1 ? It helps to make a sketch of the situation. Tries 0/10 At 4.225 scconds after noon both blocks were at rest at the positions given above. At 4.55 seconds after noon, what is the (vector) momentum of block 2 ?
P
2
=⟨,⟩ Tries 0/10 At 4.55 seconds after noon, What is the (vectot) momentum of block 17
P
1
=⟨,… Tries 0/10 At 4.55 seconds after noon, which one of the following statements is true? Block 2 is moving faster than block 1 Block 1 and block 2 have the same speed. Block 1 is moving faster than block 2 .
the vector gravitational force acting on block 2 due to block 1 is approximately 1.2674 x 10^(-7) N in magnitude.
To determine the vector gravitational force acting on block 2 due to block 1, we can use Newton's law of universal gravitation:
F = G * (m1 * m2) / r^2
where F is the gravitational force, G is the gravitational constant (approximately 6.67430 x 10^(-11) N m^2/kg^2), m1 and m2 are the masses of the two blocks, and r is the distance between their centers of mass.
Given that the mass of block 1 is 37 kg and its position is (4, 11, 0) m, and the mass of block 2 is 1140 kg and its position is (22, 11, 0) m, we can calculate the distance between their centers of mass:
r = √((x2 - x1)^2 + (y2 - y1)^2 + (z2 - z1)^2)
r = √((22 - 4)^2 + (11 - 11)^2 + (0 - 0)^2)
r = √(18^2 + 0^2 + 0^2)
r = 18 m
Now we can calculate the gravitational force:
F = (6.67430 x 10^(-11) N m^2/kg^2) * (37 kg * 1140 kg) / (18 m)^2
F ≈ 1.2674 x 10^(-7) N
Therefore, the vector gravitational force acting on block 2 due to block 1 is approximately 1.2674 x 10^(-7) N in magnitude.
For the second part of the question, to determine the momentum of block 2 at 4.55 seconds after noon, we need to know its velocity. Without that information, we cannot calculate the momentum. Please provide the velocity of block 2 at that time so that we can assist you further.
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The gravitational force acting on block 2 from block 1 depends on the distances between them but can't be calculated with the given information. The momentum of block 2 at any given time would be zero due to no external forces. The comparison of speed of block 1 and block 2 can't be made without information about their velocities.
Explanation:The gravitational force acting on block 2 due to block 1 can be calculated using Newton's law of gravitation. This law states that every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
To calculate the vector force, we would need to know the exact position of these two blocks in three dimensional space. This would involve calculating the distance vector from block 1 to block 2, then use this to calculate the force vector by multiplying the magnitude of the gravitational force (calculated using Newton's law) by the unit vector in the direction of the distance vector. However, given the current details, a precise calculation can't be performed.
As for the momentum of block 2 at 4.55 seconds after noon, it can be calculated using the equation p = mv , where p is momentum, m is mass and v is velocity. Since no external forces are mentioned, block 2 would remain at rest, meaning its velocity is 0 and thus its momentum is also 0.
The question about whether block 1 is moving faster than block 2, or vice versa or both have the same speed, cannot be answered without knowing details about their velocities.
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A point charge q=−0.53nC is fixod at the origin. Part A Where must a proton be placed in order for the electric force acting on it to be exactly opposite to its weight? (Lot the y axis be vertical and the x axis be horizontal.) Express your answer using two significant figures
The proton must be placed at a distance of 2.9 × 10^-6 m from the point charge at the origin in the negative x-direction so that the electric force acting on it is exactly opposite to its weight.
Given data:
Charge of point charge q = -0.53 n
CThe proton has a positive charge, which means it is attracted towards the negative charge and is under the influence of the gravitational force. Now we have to find the position of the proton, where the electric force will be equal to the weight of the proton and in the opposite direction to the weight of the proton.
Part A
To find the position where the electric force will be equal to the weight of the proton and in the opposite direction to the weight of the proton, we have to consider the equation for the electric force and the weight of the proton.
F_e= \frac{kq_1q_2}{r^2}F_g=mg
where
Fe = Electric forceq1 = Charge of point chargeq2 = Charge of proton
r = Distance between charges
G = Gravitational constant
m = Mass of proton
g = Acceleration due to gravityI
n the question, the proton should be at such a distance where Fe and Fg have opposite signs. So, we need to add the negative sign in the electric force equation.
F_e=- \frac{kq_1q_2}{r^2}F_g=mg
The electric force and weight of the proton should have equal magnitude and opposite direction.
So, we equate the magnitude of the electric force with the weight of the proton
.\frac{kq_1q_2}{r^2} = g\frac{q_1q_2}{r^2} = \frac{mg}{k}q_2 = \frac{mg}{kq_1}q_2 = \frac{(9.8\text{ m/s}^2)(1.67×10^{-27}\text{ kg})}{(8.99×10^9\text{ N m}^2/\text{C}^2)(-0.53×10^{-9}\text{ C})}q_2 = 3.46 × 10^{-19} \text{ C}
The charge on the proton is 3.46 × 10^-19 C.
The proton is positively charged, which means it will be attracted towards the negatively charged point charge that is fixed at the origin. So, the proton must be placed on the x-axis in the negative x-direction so that it is at a distance of 2.9 × 10^-6 m from the point charge at the origin.
Let the proton be placed at a distance of r from the point charge at the origin.
Then,\frac{kq_1q_2}{r^2} = mg\frac{(8.99×10^9\text{ N m}^2/\text{C}^2)(-0.53×10^{-9}\text{ C})(3.46 × 10^{-19} \text{ C})}{r^2} = (9.8\text{ m/s}^2)(1.67×10^{-27}\text{ kg})r^2 = \frac{(8.99×10^9\text{ N m}^2/\text{C}^2)(-0.53×10^{-9}\text{ C})(3.46 × 10^{-19} \text{ C})}{(9.8\text{ m/s}^2)(1.67×10^{-27}\text{ kg})}r = 2.9 × 10^{-6} \text{ m}
Therefore, the proton must be placed at a distance of 2.9 × 10^-6 m from the point charge at the origin in the negative x-direction so that the electric force acting on it is exactly opposite to its weight.
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A ball is thrown downward with an initial velocity of 13 m/s. Using the approximate value of g=10 m/s
2
, calculate the velocity of the ball 1.8 seconds after it is released. The velocity of the ball is m/s.
The velocity of the ball 1.8 seconds after it is released is 5.6 m/s.ExplanationA ball is thrown downward with an initial velocity of 13 m/s. Given,Initial velocity u = 13 m/sThe ball is thrown downward which means it is thrown in the downward direction.
Hence, acceleration will be acting in the downward direction and acceleration due to gravity g = 10 m/s²Time taken t = 1.8 secondsWe have to find the velocity of the ball after 1.8 seconds.Solution:Using the third equation of motion, we have, v = u + atwherev is the final velocity of the ballu is the initial velocity of the balla is the acceleration of the ballt is the time taken by the ballFrom the given values, we can substitute,u = 13 m/sa = 10 m/s²t = 1.8 secondsSubstituting these values in the equation above,
we get:v = u + atv = 13 m/s + 10 m/s² × 1.8 secondsv = 13 m/s + 18 m/sv = 31 m/sTherefore, the velocity of the ball 1.8 seconds after it is released is 31 m/s.Approximately, g = 10 m/s²Using the approximate value of g=10 m/s², we can also use the below formula,v = u + gtwherev is the final velocity of the ballu is the initial velocity of the ballg is the acceleration of the ballt is the time taken by the ballFrom the given values, we can substitute,u = 13 m/sg = 10 m/s²t = 1.8 secondsSubstituting these values in the equation above, we get:v = u + gtv = 13 m/s + 10 m/s² × 1.8 secondsv = 13 m/s + 18 m/sv = 31 m/sTherefore, the velocity of the ball 1.8 seconds after it is released is 31 m/s.
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A small plastic bead has a mass of 3.82 g and a charge of −18.2μC. It levitates, motionless, when placed in a uniform electric field perpendicular to the ground. What is the magnitude of the electric field (in N/C)? N/C What is the direction of the electric field? upward downward east west
The small plastic bead, with a mass of 3.82 g and a charge of −18.2 μC, remains motionless in a uniform electric field perpendicular to the ground. The magnitude of the electric field is determined to be 2054 N/C. The direction of the electric field is upward, as indicated by the negative charge on the bead and the attraction between opposite charges.
A small plastic bead, with a mass of 3.82 g and a charge of −18.2 μC, remains motionless in a uniform electric field perpendicular to the ground. The magnitude of the electric field (in N/C) can be determined using the formula E = F/q, where F represents the force of gravity and q represents the charge on the bead.
The force of gravity, F, can be calculated as [tex]F = mg[/tex], where m is the mass of the bead and g is the acceleration due to gravity. Substituting the values, we find [tex]F = 3.82 \times 10^{-3} kg \times 9.8 m/s^2 = 3.74 \times 10^{-2} N.[/tex]
Given that q is[tex]-18.2 \times 10^{-6} C[/tex], we can now calculate the electric field, E, as [tex]E = \frac{F}{q} = \frac{(3.74 \times 10^{-2} N)}{(18.2 \times 10^{-6} C)} = 2054 N/C.[/tex]
It is important to note that the direction of the electric field is upward due to the negative charge on the bead. In electric fields, opposite charges attract each other, so the electric field lines of force emanate from positive charges and terminate on negative charges. The direction of the electric field is taken as the direction in which a positive charge would experience a force.
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Vector A has a magnitude of 147 units and points 33.0
∘
north of west. Vector
B
points 67.0
∘
east of north. Vector
C
points 20.0
∘
west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector
B
and (b) vector
C
. (a) Number.........Units.......(b) Number.......... Units......
The magnitude of vector B is 119.9 units and points 67.0° east of north.
The magnitude of vector C is 89.5 units and points 20.0° west of south.
Given:
Vector A has a magnitude of 147 units and points 33.0° north of west.
Vector B points 67.0° east of north.
Vector C points 20.0° west of south.
Calculate the components of each vector.
For vector A:
Ax = -147 * cos(33°)
Ay = -147 * sin(33°)
For vector B:
Bx = B * cos(67°)
By = B * sin(67°)
For vector C:
Cx = -C * cos(20°)
Cy = -C * sin(20°)
Set up the equations based on the sum of vectors being zero.
Ax + Bx + Cx = 0
Ay + By + Cy = 0
Substitute the component values into the equations and solve for B and C.
B * sin(67°) - 147 * cos(33°) - C * cos(20°) = 0
B * cos(67°) + C * sin(20°) - 147 * sin(33°) = 0
Solve the system of equations.
substitute the expressions into the equations and solve for B and C.
Obtain the magnitudes of vector B and vector C.
The magnitude of vector B is the absolute value of B.
The magnitude of vector C is the absolute value of C.
The magnitude of vector B is 119.9 units.
The magnitude of vector C is 89.5 units.
The magnitudes of vector B and vector C are 119.9 units and 89.5 units, respectively.
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The energy required to increase the speed of a certain car from
14 to 26 m/s is 170 kJ. What is the mass of the car, in
kilograms?
The mass of the car is 925 kg.
Kinetic energy (K) of an object is given by the formula, K = 1/2mv², where m is the mass of the object and v is its velocity. The difference between initial kinetic energy and final kinetic energy gives the kinetic energy required to increase the speed of the object.
So we can say that, K2 - K1 = 170 kJ
Here, the initial speed of the car is 14 m/s and the final speed of the car is 26 m/s.
Substituting these values in the formula, we get,1/2m(26² - 14²) = 170 kJ
On solving, we get,
m = 925 kg
Therefore, the mass of the car is 925 kg.
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Find the following for path D in Figure 3.56 : (a) the total distance traveled and (b) the magnitude and direction of the displacement from start to finish. In this part of the problem, expllieitly show how you follow the steps of the analytical method of vector addition. Figure 3.56 The various knes represent paths taken by different people wallong in a city All blocks are 120 m on a side. 14. Find the following for path D in Figure 3.56 : (a) the total distance traveled and (b) the magnitude and direction of the displacement from start to finish. In this part of the problem, explicitiy showhow: you follow the steps of the analytical method of vector addition.
a) The total distance traveled along path D is 1,080 m. b) The magnitude of displacement is calculated using the Pythagorean theorem is 648.07 m and the direction is approximately 68.2° above the positive x-axis.
To find the total distance traveled along path D in Figure 3.56, we need to determine the length of each segment and sum them up. According to the given information, all blocks are 120 m on a side. By carefully following the path, we can determine the lengths of each segment:
Segment AB: The path moves right, covering 3 blocks, so the distance traveled is 3 * 120 m = 360 m.
Segment BC: The path moves up, covering 2 blocks, so the distance traveled is 2 * 120 m = 240 m.
Segment CD: The path moves left, covering 1 block, so the distance traveled is 1 * 120 m = 120 m.
Segment DE: The path moves up, covering 3 blocks, so the distance traveled is 3 * 120 m = 360 m.
Therefore, the total distance traveled along path D is 360 m + 240 m + 120 m + 360 m = 1,080 m.
To find the displacement from start to finish, we need to calculate the magnitude and direction. We can follow the steps of the analytical method of vector addition:
Break down each segment into its x (horizontal) and y (vertical) components.
AB: x-component = 360 m, y-component = 0 m
BC: x-component = 0 m, y-component = 240 m
CD: x-component = -120 m, y-component = 0 m
DE: x-component = 0 m, y-component = 360 m
Sum up the x-components: 360 m - 120 m = 240 m
Sum up the y-components: 240 m + 360 m = 600 m
The magnitude of displacement is calculated using the Pythagorean theorem: √(240 m^2 + 600 m^2) ≈ 648.07 m.
To find the direction, we can use trigonometry. The angle θ can be found by taking the inverse tangent of the ratio of the y-component to the x-component: θ = tan^(-1)(600 m / 240 m) ≈ 68.2°.
Therefore, the magnitude of displacement is approximately 648.07 m, and the direction is approximately 68.2° above the positive x-axis.
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Starting frem rest, a rectangular toy block with mass 275.9 sides in 2.10 s all the way across a table 1.80 min length that Zak has tilted at an angle of 32.5∘ to the horizontal. (o) What is the magnitude of the acceleration of the toy block? m/s2 (b) What is the coeticient of winetic friction between the block and the table? We Your response defers from the correc answer by more than 1096. Doubie check your calculations. (c) What are the macnitude and crection of the frictien force acting on the block? magnitude direction (d) What is the speed of the tilock when is is at the end of the table, having sid a distance of 1.80 m ? an Yeur response chers from the correct answer by mere than 10%, Double check your calculatians: nVs
The magnitude of the acceleration of the toy block is 0.015 m/s2. the coefficient of kinetic friction between the block and the table is `0.001792`. The direction of the frictional force is towards the rest of the block.The speed of the block when it is at the end of the table is 0.25 m/s.
a) The formula for acceleration is given by the formula,`a = (vf - vi)/t`Where `vf` is the final velocity, `vi` is the initial velocity, and `t` is the time taken. In this case, `vf = d/t`.
Here, `d` is the distance travelled by the block and `t` is the time taken.
The initial velocity of the block is zero.
Therefore, the formula for acceleration can be rewritten as `a = 2d/t^2`.
The block has moved a distance equal to the length of the table, which is 1.80 m.
Therefore, the distance travelled by the block is d = 1.80 m.
The time taken by the block to travel the length of the table is t = 2.10 s.
Substituting the values, we get: `a = 2(1.80)/2.10^2 = 0.015 m/s^2`.
Therefore, the magnitude of the acceleration of the toy block is 0.015 m/s2
.b) The formula for kinetic friction is given by the formula `f = µkN`. Where `f` is the force of friction, `µk` is the coefficient of kinetic friction, and `N` is the normal force.
The normal force acting on the block is given by `N = mg cosθ`.
Here, `m` is the mass of the block, `g` is the acceleration due to gravity, and `θ` is the angle of inclination of the table.
Substituting the values, we get: `N = 275.9 × 9.81 × cos 32.5∘ = 2309.7 N`.
The force of friction acting on the block is given by `f = ma`.
Substituting the values, we get: `f = 275.9 × 0.015 = 4.14 N`.
Therefore, the coefficient of kinetic friction between the block and the table is `µk = f/N = 4.14/2309.7 = 0.001792`.
c) The frictional force acting on the block is given by `f = µkN = 0.001792 × 2309.7 = 4.14 N`.
The frictional force acts in a direction opposite to the direction of motion of the block.
Therefore, the direction of the frictional force is towards the rest of the block.
d) The final velocity of the block can be calculated using the formula `v^2 = u^2 + 2as`.
Here, `u` is the initial velocity, `v` is the final velocity, `a` is the acceleration of the block, and `s` is the distance travelled by the block.
The initial velocity of the block is zero.
Therefore, the formula can be simplified as `v = √(2as)`.
Substituting the values, we get: `v = √(2 × 0.015 × 1.80) = 0.25 m/s`.
Therefore, the speed of the block when it is at the end of the table is 0.25 m/s.
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A group of students observes that a wooden block (m=0.40 kg) on the end of a string with a radius of 0.7 meters makes 13 rotations in 20.7 seconds when twirled. What is the block's tangential (linear) speed? Part B What is the block's angular speed?
The tangential speed of a block on a string can be calculated using the formula (2π * radius * number of rotations) divided by time, while the angular speed is (2π * number of rotations) divided by time.
Part A:
To find the block's tangential (linear) speed, we can use the formula:
Tangential speed = (2πr * number of rotations) / time
Given that the radius (r) is 0.7 meters, the number of rotations is 13, and the time is 20.7 seconds, we can plug in these values to calculate the tangential speed:
Tangential speed = (2π * 0.7 * 13) / 20.7
Calculating the above expression gives us the tangential speed of the block.
Part B:
The angular speed of the block can be found using the formula:
Angular speed = (2π * number of rotations) / time
Using the given values of 13 rotations and 20.7 seconds, we can substitute them into the formula to calculate the angular speed:
Angular speed = (2π * 13) / 20.7
This calculation will give us the angular speed of the block.
It's important to note that the tangential speed is the linear speed at the edge of the circular path, while the angular speed is the rate at which the object rotates, expressed in radians per second.
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suitcase is 20.0 N. (a) Draw a free-body diagram of the suitcase. No file chosen This answer has not been graded yet. (b) What angle does the strap make with the horizontal (in degrees)? (c) What is the magnitude of the normal force that the ground exerts on the suitcase (in N)? N rolling friction is independent of the angle of the strap. (e) What is the maximum acceleration of the suitcase if the woman can exert a maximum force of 38.7 N ? (Enter the magnitude in m/s
2
.) m/s
2
F_ applied is the force applied by the woman (38.7 N), F_ friction is the force of rolling friction, and m is the mass of the suitcase.
In this case, the vertical component is the weight of the suitcase (20.0 N) and the horizontal component is the tension in the strap. The magnitude of the normal force (N) exerted by the ground on the suitcase is equal to the weight of the suitcase, which is given as 20.0 N. Rolling friction is independent of the angle of the strap. The maximum acceleration of the suitcase can be calculated using Newton's second law of motion. The angle that the strap makes with the horizontal can be determined using trigonometry.
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At the same moment from the top of a building 3.0×10^2
m tall, one rock is dropped and one is thrown downward with an initial velocity of 10 m/s. Both of them experience negligible air resistance. How much EARLIER does the thrown rock strike the ground? Your answer: They land at exacly the same time. 0.865 0.525 0.955 0.675
The thrown rock takes approximately 5.94 s to reach the ground. The correct answer is: 1.88 s.
The time it takes for an object to fall freely from a height h can be calculated using the equation: t = √(2h/g)
For the dropped rock: h = 3.0 × 10^2 m
t_dropped = √(2(3.0 × 10^2)/9.8)
t_dropped ≈ √(600/9.8)
t_dropped ≈ 7.82 s
For the thrown rock: h = 3.0 × 10^2 m
v_initial = 10 m/s
g = 9.8 m/s^2
The time it takes to reach the ground can be calculated using the equation: h = v_initial * t_thrown + (1/2) * g * t_thrown^2
3.0 × 10^2 = 10 * t_thrown + (1/2) * 9.8 * t_thrown^2
Simplifying the equation:4.9 * t_thrown^2 + 10 * t_thrown - 3.0 × 10^2 = 0
Solving this quadratic equation, we find two solutions for t_thrown: t_thrown ≈ -13.18 s and t_thrown ≈ 5.94 s.
Comparing the times, we find that the thrown rock strikes the ground approximately 7.82 s - 5.94 s = 1.88 s earlier than the dropped rock.
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An electromagnetic wave has a wavelength of 768 micrometers.
What is the frequency of this electromagnetic wave? Express your answer in GigaHertz and keep three significant digits
The frequency of this electromagnetic wave is approximately 391 GHz.
The frequency of an electromagnetic wave can be calculated using the formula: f = c / λ, where f is the frequency, c is the speed of light (approximately 3.00 × 10^8 meters per second), and λ is the wavelength.
First, let's convert the wavelength from micrometers to meters:
λ = 768 micrometers * (1 × 10^(-6) meters per micrometer) = 0.000768 meters.
Now we can calculate the frequency:
f = (3.00 × 10^8 meters per second) / (0.000768 meters) = 3.91 × 10^11 Hz.
To express the frequency in GigaHertz (GHz), we divide the frequency by 10^9: f = (3.91 × 10^11 Hz) / (10^9) = 391 GHz (rounded to three significant digits).
Therefore, the frequency of this electromagnetic wave is approximately 391 GHz.
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(a) With what speed must a ball be thrown vertically from ground level to rise to a maximum height of 54 m? (b) How long will it be in the air? (a) Number Units
(a) The ball must be thrown vertically from ground level to rise to a maximum height of 54 m at a speed of 32.55 m/s . (b) The ball will be in the air for 5.52 sec.
(a) We can use the equation,
v^2 - u^2 = 2gh
Here, v = final velocity = 0 (at maximum height)
u = initial velocity
g = acceleration due to gravity = 9.8 m/s^2
h = maximum height = 54 m
Plugging in the values and solving for u,
u^2 = 2gh - v^2
= 2 × 9.8 × 54 - 0
= 1058.8u = ±√1058.8
= 32.55 m/s (rounded to two decimal places)
Therefore, ball must be thrown vertically from ground level to rise to a maximum height of 54 m at a speed of 32.55 m/s .
(b)We can use the formula,
s = ut + 1/2gt^2
Here, s = maximum height = 54 m
u = initial velocity = 32.55 m/s
g = acceleration due to gravity = 9.8 m/s^2
t = time taken
Plugging in the values,
54 = 32.55t + 1/2 × 9.8 × t^2
Simplifying,4.9t^2 + 32.55t - 54 = 0
Solving this quadratic equation, we get, t = 5.52 s
Therefore the ball will be in the air for 5.52 sec.
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A car is moving at 9 m/s when it accelerates at 1.9 m/s2 for 27 seconds. What was
the final speed?
The final speed of the car after acceleration at 1.9 m/s^2 for 27 seconds is approximately 60.3 m/s.
The final speed of the car can be calculated using the formula for uniformly accelerated motion:
The final speed of the car can be determined using the formula:
final speed = initial speed + (acceleration * time)
Given:
Initial speed (u) = 9 m/s
Acceleration (a) = 1.9 m/s^2
Time (t) = 27 seconds
Plugging in these values into the formula, we can calculate the final speed:
final speed = 9 m/s + (1.9 m/s^2 * 27 s)
final speed = 9 m/s + 51.3 m/s
final speed ≈ 60.3 m/s
Therefore, the final speed of the car after accelerating at 1.9 m/s^2 for 27 seconds is approximately 60.3 m/s.
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(3 peinti) Compute the diop in blood pressure along a 25−cm length of artery of radius 4 thmm. Arsume that the antery camss biood at a rate of 7 fiterimin. (viscosty of blood =0.04 poise)
the diop in blood pressure along a 25−cm length of artery of radius 4 thmm is approximately 37.8 kPa.
Diop in blood pressure along a 25−cm length of artery of radius 4 thmm can be computed as follows.Diop in blood pressure along a length of an artery is the change in the pressure of the blood as it moves from one end to another end of the artery. It is denoted by ΔP.
The formula to calculate ΔP is given by:ΔP = 4 × Q × L × η / π × r⁴WhereQ = flow rate of the bloodL = length of the arteryr = radius of the arteryη = viscosity of the bloodWe know that the length of the artery, L = 25 cm = 0.25 m
Radius of the artery, r = 4 µm = 4 × 10⁻⁶ m
Flow rate of the blood, Q = 7 L/min = 7 × 10⁻³ m³/sViscosity of the blood, η = 0.04 poise = 0.04 × 10⁻² Pa.s
Therefore,ΔP = 4 × Q × L × η / π × r⁴= 4 × 7 × 10⁻³ × 0.25 × 0.04 × 10⁻² / π × (4 × 10⁻⁶)⁴= 3.78 × 10⁴ Pa≈ 37.8 kPa,
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An object is launched with an initial velocity of 3.5 m/s at an initial angle of 52
∘
above the ground from a height of 0.0 m. After the object has traveled for 0.5 seconds, how far in the x-direction has the object traveled? 1.8 m 3.5 m 1.1 m 7.0 m 2.2 m
The object has traveled 0.9 meters in the x-direction after 0.5 seconds because the horizontal component of the initial velocity is 1.8 meters per second.
The horizontal component of the initial velocity is the part of the velocity that is parallel to the x-axis. The vertical component of the initial velocity is the part of the velocity that is parallel to the y-axis.
The distance traveled in the x-direction after 0.5 seconds is simply the horizontal component of the initial velocity multiplied by the time.
The horizontal component of the initial velocity is:
v_x = v_0 * cos(theta) = 3.5 m/s * cos(52°)
v_x = 1.8 m/s
The distance traveled in the x-direction after 0.5 seconds is:
x = v_x * t = 1.8 m/s * 0.5 s
x = 0.9 m
Therefore, the object has traveled 0.9 m in the x-direction after 0.5 seconds.
The other answer choices are incorrect. 3.5 m is the total initial velocity, not the horizontal component. 1.1 m and 7.0 m are the horizontal distances traveled after 1.0 and 2.0 seconds, respectively. 2.2 m is the horizontal distance traveled after 1.0 second.
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The force exerted by an ideal spring is a conservative force, and the vertical forces do no work, so the total mechanical energy of the system is (A) conserved (C) zero (D) none of the above
the total mechanical energy of the system is (A) conserved.
Conservative forces, such as the force exerted by an ideal spring, have the property that the total mechanical energy of a system is conserved. Mechanical energy is the sum of the kinetic energy and potential energy of the system.
In the case of an ideal spring, as long as there are no non-conservative forces (such as friction or air resistance) acting on the system, the total mechanical energy remains constant. The potential energy of the spring changes as it is compressed or stretched, but this change is compensated by the corresponding change in kinetic energy of the system.
Therefore, the total mechanical energy of the system, which includes the kinetic and potential energies, is conserved.
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projectile is fired from the ground (you can assume the initial height is the same as the ground) in a field so there are no obstacles in its way. It is fired at an angle of 13
∘
with respect to the horizontal and with an initial speed of 45 m/s. Air resistance is negligible in this situation. Call up the positive y direction, and toward the wall the positive x direction.
The projectile will have a horizontal displacement of approximately 43.56 meters when it hits the ground.
To analyze the motion of the projectile, we can separate its initial velocity into horizontal and vertical components. The horizontal component will remain constant throughout the motion, while the vertical component will be affected by gravity.
Initial angle of projection, θ = 13°
Initial speed, v₀ = 45 m/s
We can find the initial horizontal velocity (v₀x) and initial vertical velocity (v₀y) using trigonometric functions:
v₀x = v₀ * cos(θ)
v₀y = v₀ * sin(θ)
Substituting the given values:
v₀x = 45 m/s * cos(13°)
v₀y = 45 m/s * sin(13°)
Now, let's analyze the horizontal and vertical motion separately.
Horizontal Motion:
Since there is no horizontal acceleration, the horizontal velocity remains constant throughout the motion.
The horizontal displacement (Δx) can be calculated using the formula:
Δx = v₀x * t
Vertical Motion:
The vertical motion is affected by gravity, which causes a constant downward acceleration.
The vertical displacement (Δy) can be calculated using the formula:
Δy = v₀y * t + (1/2) * g * t²
where g is the acceleration due to gravity (approximately 9.8 m/s²).
To find the time of flight (T), we can consider the vertical motion. At the highest point of the projectile's trajectory, the vertical velocity becomes zero. We can use this information to find the time it takes to reach the highest point.
v_y = v₀y - g * t_max
where v_y is the vertical velocity, v₀y is the initial vertical velocity, g is the acceleration due to gravity, and t_max is the time it takes to reach the highest point.
Setting v_y = 0 and solving for t_max:
0 = v₀y - g * t_max
t_max = v₀y / g
Once we have the time of flight, we can find the total horizontal displacement by multiplying the horizontal velocity by the time of flight:
Δx_total = v₀x * T
Now, let's calculate these values.
Substituting the values:
v₀x = 45 m/s * cos(13°)
v₀y = 45 m/s * sin(13°)
v₀x ≈ 43.69 m/s
v₀y ≈ 9.77 m/s
To find t_max:
t_max = v₀y / g
t_max = 9.77 m/s / 9.8 m/s²
t_max ≈ 0.997 s
To find Δx_total:
Δx_total = v₀x * T
Δx_total = 43.69 m/s * 0.997 s
Δx_total ≈ 43.56 m
Therefore, the projectile will have a horizontal displacement of approximately 43.56 meters when it hits the ground.
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(a) Calculate the height (in m ) of a cliff if it takes 2.19 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.05 m/s. (Enter a number.) m (b) How long (in s) would it take to reach the ground if it is thrown straight down with the same speed? (Enter a number.)
The Time can't be zero so it will take 4.37 seconds to reach the ground.
Initial velocity = 8.05 m/s
Time taken = 2.19 s
We have to find the height of the cliff.
From the kinematic equation:v = u + at
v = final velocity
u = initial velocity
a = acceleration
t = time
Taken
The initial velocity as u is positive as it is in the upward direction.
Using first equation of motion we can find acceleration.
a = (v - u) / ta = (0 - 8.05) / 2.19a = -3.68 m/s²
Now, we can find the distance covered (height of the cliff) using third equation of motion.
s = ut + 1/2 at²s = 8.05 x 2.19 + 1/2 (-3.68) x (2.19)²s = 17.59 m
So, the height of the cliff is 17.59 m.
Now, for part (b) the initial velocity is also 8.05 m/s but the direction is downwards so it is negative.
Using third equation of motion we can find time taken.
0 = -8.05 x t + 1/2 (-3.68) x t²0 = t(-8.05 - 1.84t)t² - 4.37t = 0t(t - 4.37) = 0So, t = 0 or 4.37 s.
Time can't be zero so it will take 4.37 seconds to reach the ground.
So, the answer is: (a) 17.59 m (b) 4.37 seconds
Learn more about seconds with the given link,
https://brainly.com/question/102751
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