The car will coast approximately 98.47 meters before starting to roll back down the slope.
To find the distance the car will coast before starting to roll back down, we can analyze the forces acting on the car.
The force of gravity acting on the car can be decomposed into two components: one parallel to the slope (mg*sin(θ)) and the other perpendicular to the slope (mg*cos(θ)), where m is the mass of the car and θ is the angle of the slope.
The force opposing the car's motion is the friction force, which is given by the equation f_friction = μ * N, where μ is the coefficient of friction and N is the normal force.
When the car comes to a stop, the force of gravity parallel to the slope is equal to the friction force. Therefore, we can equate these two forces:
mg * sin(θ) = μ * mg * cos(θ)
Simplifying:
tan(θ) = μ
Given that the car runs out of gas and comes to a stop, we can assume that the coefficient of friction is the static friction coefficient (μ_s). Therefore, we can calculate θ using the inverse tangent function:
θ = arctan(μ_s)
Substituting the known values:
θ = arctan(μ_s) = arctan(0.9) ≈ 41.19 degrees
Now we can find the distance the car will coast using the formula:
distance = (initial velocity)^2 / (2 * acceleration)
The acceleration of the car is given by the component of gravity parallel to the slope:
acceleration = g * sin(θ)
Substituting the known values:
distance = (33 m/s)^2 / (2 * 9.8 m/s^2 * sin(41.19 degrees))
Calculating the result:
distance ≈ 98.47 m
Therefore, the car will coast approximately 98.47 meters before starting to roll back down.
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A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.0 dB and the other records a sound level of 80.0 dB, how far is the speaker from each observer?
A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.0 dB and the other records a sound level of 80.0 dB, speaker is at a distance of 100m from each observer.
The amount of space between two points or objects is often referred to as their distance. It is a measurement of the separation between certain points or things. Depending on the situation and the chosen system of measurement, distance can be expressed in a variety of ways, including metres, kilometres, miles, feet, and more.
Sound level for Observer 1 (closer): L1 = 60.0 dB
Sound level for Observer 2 (farther): L2 = 80.0 dB
Distance between the two observers: Total distance = 110 m
Difference in sound level = L2 - L1
= 80.0 dB - 60.0 dB
= 20.0 dB
ΔL = 20×log10(d2 / d1)
20 × log10(d2 / d1) = 20.0 dB
d2 / d1 = 10
d1 + d2 = 110 m
d1 + 10 × d1 = 110 m
d1 = 10 m
d2 = 10 × d1
= 10 * 10 m
= 100 m
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To determine the distance between the speaker and each observer, we can use the difference in sound levels recorded and the fact that each factor of 10 in intensity corresponds to 10 dB. By setting up equations and using logarithmic calculations, we can find that the speaker is 100 times more intense at the farther observer's location than at the closer observer's location.
Explanation:To find the distance between the speaker and each observer, we need to use the fact that each factor of 10 in intensity corresponds to 10 dB. Knowing that, we can use the difference in sound levels recorded by the two observers to determine the distance. Let's assume that the observer who recorded 60.0 dB is closer to the speaker than the observer who recorded 80.0 dB.
Since the difference in sound levels is 20.0 dB (80.0 dB - 60.0 dB), and each factor of 10 in intensity corresponds to 10 dB, we can determine that the speaker is 100 times more intense at the farther observer's location than at the closer observer's location.
Thus, we can set up the equation: (Intensity at Farther Observer) = 100 x (Intensity at Closer Observer). Using the equation for sound intensity level (L = 10log(I/I₀)), we know that the sound level at the closer observer is 60.0 dB and the level at the farther observer is 80.0 dB.
10log(I₁/I₀) = 60.0 dB and 10log(I₂/I₀) = 80.0 dB.
From the information given, we can calculate the intensities at each observer by simplifying the equations:
I₁/I₀ = 10^(60/10) = 1000 and I₂/I₀ = 10^(80/10) = 10000.
Since (Intensity at Farther Observer) = 100 x (Intensity at Closer Observer), we can write:
10000 = 100 x I₁/I₀ or 10000 = 100 x 1000.
From here, we can solve for I₀ (the intensity at the closer observer's location):
I₀ = 10000 / 100 = 100.0.
Finally, using the equation for sound intensity level, we can determine the distance between the speaker and each observer:
10log(I/I₀) = 60.0 dB or 10log(I/100.0) = 60.0 dB.
Rearranging the equation and solving for I, we get:
I = 100.0 x 10^(60/10) = 100.0 x 1000 = 100000.0.
The distance between the closer observer and the speaker can now be calculated using the equation for sound intensity level:
10log(I/100.0) = 60.0 dB.
Solving for I:
I = 100.0 x 10^(60/10) = 100.0 x 1000 = 100000.0.
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John's mass is 98.3 kg and Barbara's is 62.3 kg. He is standing on the x axis at x
j
=+9.67 m, while she is standing on the x axis at x
B
+219 m. They switch positions: How far and in which direction does their center of mass move as a result of the switch? Distance moved by center of mass -
The center of mass formula can be applied to determine how far and in which the center of mass of the system moves as a result of the switch.
Center of mass (C) = m1d1 + m2d2 / m1 + m2
where,m1 is the mass of Johnm2 is the mass of Barbarad1 is the distance of John from the origin or reference pointd2 is the distance of Barbara
from the origin or reference pointOn substituting the given values,
we get;
C = (98.3 kg)(9.67 m) + (62.3 kg)(219 m) / (98.3 kg + 62.3 kg)C = 66.0 m
Since the distance between the initial and final position of the center of mass is 0, we can say that the center of mass moves by 0 meters.In which direction the center of mass moves,
Since the distance between the initial and final position of the center of mass is 0, we can say that the center of mass moves in no direction.
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The magnification produced by a converging lens is found to be −2.73 for an object placed 0.21 m from the lens. What is the focal length of the lens? Answer in units of m.
The focal length of the lens is 0.136 m.
For a converging lens, the formula to find the focal length is:1/f = 1/v - 1/uWhere,f = focal lengthv = image distanceu = object distance
Given that,magnification, m = v/u = -2.73...[1]
We have the formula for magnification as,m = -v/u
On substituting the value of v from equation [1] we get, -2.73 = -v/0.21
On solving the above equation we get,v = 0.57...[2]
Now, on substituting the values of u and v in the formula of focal length we get,1/f = 1/0.57 - 1/0.21
On solving we get,f = 0.1356 ≈ 0.136...
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If
B
is added to
C
=3.8
i
^
+6.5j, the result is a vector in the positive direction of the yaxis, with a magnitude equal to that of
C
. What is the magnitude of
B
? Number Units Attempts: 0 of 15 used
The magnitude of vector B is zero.
Let's break down the problem and solve it step by step.
We have the vector C = 3.8i^ + 6.5j, and when vector B is added to C, the resulting vector is in the positive direction of the y-axis and has the same magnitude as C.
To determine the magnitude of vector B, we can use the information about the resulting vector.
Since the resulting vector is in the positive direction of the y-axis, it means that the x-component of the resulting vector is zero.
Given that the x-component of vector B is zero, let's assume vector B as B = 0i^ + Byj, whereby represents the y-component of vector B.
Adding vector B to vector C:
C + B = (3.8 + 0)i^ + (6.5 + By)j
Since the magnitude of the resulting vector is equal to that of vector C, we can set up the following equation:
√[(3.8 + 0)^2 + (6.5 + By)^2] = √(3.8^2 + 6.5^2)
Simplifying the equation:
√[(3.8)^2 + (6.5 + By)^2] = √(3.8)^2 + (6.5)^2
√[14.44 + (6.5 + By)^2] = √14.44 + 42.25
√[14.44 + (6.5 + By)^2] = √56.69
Squaring both sides to eliminate the square root:
14.44 + (6.5 + By)^2 = 56.69
Expanding the square term:
14.44 + 42.25 + 13By + (By)^2 = 56.69
Combining like terms:
(By)^2 + 13By + 56.69 - 14.44 - 42.25 = 0
(By)^2 + 13By = 0
Now, we can solve this quadratic equation for By:
By(By + 13) = 0
From this equation, we have two possible solutions:
By = 0 or By = -13
Since the magnitude of vector B cannot be negative, we take the positive value: By = 0.
Therefore, the y-component of vector B is zero, which means vector B is in the x-direction.
To calculate the magnitude of vector B, we can use the Pythagorean theorem:
Magnitude of B = √(Bx^2 + By^2)
Magnitude of B = √(0^2 + 0^2)
Magnitude of B = √0
Magnitude of B = 0
Hence, the magnitude of vector B is zero.
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A stretched string is 2.70 m long, has a mass of 0.260 kg, and is under a tension of 36.0 N. A wave of amplitude 7.28 mm is traveling on this string. What must be the frequency of the wave for the average power to be 46.2 W ? Express your answer in Hz unit and to three significant figures.
The frequency of the wave must be approximately 1.060 Hz for the average power to be 46.2 W.
To find the frequency of the wave, we can use the formula for the average power of a wave on a string:
P_avg = 0.5 * μ * ω^2 * A^2 * v
Where P_avg is the average power, μ is the linear mass density of the string (μ = m / L), ω is the angular frequency (ω = 2πf), A is the amplitude of the wave, and v is the velocity of the wave on the string.
First, let's find the linear mass density:
μ = m / L = 0.260 kg / 2.70 m = 0.0963 kg/m
We know the amplitude A = 7.28 mm = 7.28 x 10^(-3) m.
Next, we need to find the velocity of the wave on the string. The velocity of a wave on a string is given by:
v = √(F / μ)
Where F is the tension in the string. Plugging in the given values:
v = √(36.0 N / 0.0963 kg/m) = 16.88 m/s
Now we can substitute the known values into the power equation and solve for the angular frequency ω:
P_avg = 0.5 * μ * ω^2 * A^2 * v
46.2 W = 0.5 * 0.0963 kg/m * ω^2 * (7.28 x 10^(-3) m)^2 * 16.88 m/s
Solving for ω:
ω^2 = (46.2 W) / (0.5 * 0.0963 kg/m * (7.28 x 10^(-3) m)^2 * 16.88 m/s)
ω^2 ≈ 44.668
Taking the square root of both sides:
ω ≈ 6.680
Finally, we can find the frequency f using ω = 2πf:
6.680 = 2πf
f ≈ 1.060 Hz (rounded to three significant figures)
Therefore, The frequency of the wave must be approximately 1.060 Hz for the average power to be 46.2 W.
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Describe the protoplanet nebular model of the origin of the solar system. Which part or parts of this model seem least credible to you? Explain. What information could you look for today that would cause you to accept of modify this least credible part of the model?
The protoplanet nebular model of the origin of the solar system is the most widely accepted scientific explanation of the formation of the solar system. It suggests that the solar system formed from a rotating cloud of gas and dust called a nebula, about 4.6 billion years ago. Here is a detailed explanation of the model:
Protoplanet nebular model of the origin of the solar system
The protoplanet nebular model suggests that the solar system formed from a giant cloud of gas and dust called a nebula, which collapsed due to its gravitational attraction. As the cloud collapsed, it began to spin, forming a flat, rotating disk. The central part of the disk became very hot and dense, forming the Sun. The remaining material in the disk gradually began to coalesce into clumps called protoplanets.
The protoplanets continued to grow by accretion, eventually forming the planets and other objects in the solar system. The inner planets, including Earth, formed from the rock and metal that remained in the inner part of the disk after the Sun had formed. The outer planets, on the other hand, formed from the ice that had condensed in the cooler outer part of the disk.
Least credible part of the model
The least credible part of the protoplanet nebular model is the process of planet formation. This is because it is unclear how the tiny dust particles in the disk could have grown into the large protoplanets and planets that we see today.
Modification of this part of the model
To modify this least credible part of the model, scientists could look for more information on how dust particles clump together in the protoplanetary disk. They could also look for more information on the composition of the dust particles and how they interacted with each other. This could help scientists understand how the particles grew into larger and larger bodies, eventually forming the planets and other objects in the solar system.
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forces that are equal in size and opposite in direction
The forces that are equal in size and opposite in direction are called balanced forces.
What is force?
A force is a physical quantity that can alter the speed, direction, or state of motion of an object. When two or more forces are applied to an object and the object remains stationary or moves with constant velocity, the forces are referred to as balanced forces.
Forces can be calculated using the following formula:
F = ma
Where:
F is the force applied
m is the mass of the object
a is the acceleration of the object
Since the acceleration of an object that has balanced forces applied to it is zero, the sum of the forces on it must be equal to zero as well. It follows that if two forces are applied to an object and they are equal in magnitude but opposite in direction, they will cancel each other out, resulting in a net force of zero. This implies that forces that are equal in size and opposite in direction are referred to as balanced forces.
A balanced force does not cause an object to move or alter its motion because it is countered by an equal and opposite force acting in the opposite direction.
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A wedge or mass m=35.1 kg is located on a plane that is inclined by an angle θ=20.5 with respect to the horizontal. A force F=317.3 N in horizontal direction pushes on the wedge, as shown. The coefficient of friction between the wedge and the plane is 0.185. What is the acceleration of the wedge along the plane? (Negative numbers for motion to the left, and positive numbers for motion to the right, please.) Tries 2/99 Preyious Ities
The acceleration of the wedge along the inclined plane is determined by the equation F - μ * mg * cos(θ) = m * a, where F is the applied force, μ is the coefficient of friction, m is the mass of the wedge, g is the acceleration due to gravity, θ is the angle of inclination, and a is the acceleration.
To find the acceleration of the wedge along the plane, we need to consider the forces acting on the wedge. The force pushing on the wedge can be resolved into two components: the force parallel to the inclined plane (F_parallel) and the force perpendicular to the inclined plane (F_perpendicular).
The force of gravity acting on the wedge can also be resolved into two components: the force parallel to the inclined plane (mgsin(θ)) and the force perpendicular to the inclined plane (mgcos(θ)).
The frictional force (f) can be calculated using the coefficient of friction (μ) and the normal force (mg*cos(θ)).
Since the wedge is on the verge of sliding, the force of friction will be equal to the maximum static friction (f_max = μ * mg * cos(θ)).
Now, considering the forces along the x-axis, we can write the equation of motion as:
F_parallel - f = m * a
Substituting the expressions for F_parallel and f, we get:
F - μ * mg * cos(θ) = m * a
Plugging in the given values, we can calculate the acceleration (a) of the wedge along the plane.
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roblem 1 (True or False) or each statement, select whether it is true or false. A. If an object is at rest (and remains at rest), then then there are no forces at all acting on the object. B. An object can have a nonzero velocity even when the net external force on it is zero. C. A force is always required to sustain motion at constant velocity. D. A rock thrown straight up has zero net force at the top of its trajectory. E. If the acceleration of an object is zero, there are no forces acting on it. F. In a free-body diagram for a single object, you should draw all the forces acting on the object and all the forces that the object exerts on other objects. G. In a free-body diagram for a single object, you should draw only the forces acting on the object. H. Two forces acting on the same object, if they are equal in magnitude and opposite in direction, are an action-reaction pair as given by Newton's third law. 1. Kilogram is a unit of weight. J. The driver of the bus slams on the brakes, causing a suitcase from the front to come flying toward the rear of the bus
If an object is at rest (and remains at rest), then then there are no forces at all acting on the object - it is true.
FalseB. An object can have a nonzero velocity even when the net external force on it is zero -
TrueC. A force is always required to sustain motion at constant velocity -
FalseD. A rock thrown straight up has zero net force at the top of its trajectory -
TrueE. If the acceleration of an object is zero, there are no forces acting on it -
FalseF. In a free-body diagram for a single object, you should draw all the forces acting on the object and all the forces that the object exerts on other objects -
FalseG. In a free-body diagram for a single object, you should draw only the forces acting on the object -
TrueH. Two forces acting on the same object, if they are equal in magnitude and opposite in direction, are an action-reaction pair as given by Newton's third law - True1. A kilogram is a unit of weight -
FalseJ. The driver of the bus slams on the brakes, causing a suitcase from the front to come flying toward the rear of the bus.
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Al 42.0-yard forwand pass strakinht do whield, perpendicular to the fine of tocrimmage. How far (in yards) is the football from its original location? yd
The football is 42.0 yards away from its original location.
To determine the distance the football traveled from its original location after a 42.0-yard forward pass, we need to find the horizontal displacement.
Since the pass is made perpendicular to the line of scrimmage, the horizontal displacement is equal to the distance covered by the football during the pass.
Therefore, the football is 42.0 yards away from its original location.
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2. Explain what is meant by the term: terminal velocity.
Terminal velocity is defined as the highest speed a falling object attains when it stops accelerating due to the gravitational force acting on it and the resistance of the medium through which it is moving.
A falling object accelerates as gravity acts on it. When the gravitational force pulls the object downwards, the object's velocity increases. However, as the object falls, it encounters resistance, which opposes the gravitational force, resulting in a decrease in acceleration until the resistance is equal to the gravitational force.
When the resistance equals the gravitational force, the object no longer accelerates and reaches a constant speed, referred to as terminal velocity. Terminal velocity depends on various factors such as the object's size, shape, mass, and the medium through which it is moving.
The denser the medium through which the object is falling, the lower its terminal velocity. Objects with smaller surface areas have higher terminal velocities than those with larger surface areas, while heavier objects have higher terminal velocities than lighter objects.
Terminal velocity is an important concept in skydiving, as it determines the maximum speed a skydiver can attain during freefall. Skydivers deploy their parachutes to slow down and land safely on the ground before reaching their terminal velocity.
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Select all statements that are true. It will help to draw your own diagram before answering. Electrons in the spoon travel through the plastic and end up on the surface nearest the dust particle. Polarized molecules in the spoon create an electric field near the dust particle that points toward the spoon. Because the spoon is neutral, the charged dust particle is neither attracted to nor repelled by the spoon. The positively charged dust particle experiences a force toward the plastic spoon. Electrons in molecules in the spoon shift very slightly toward the dust particle, but stay bound in the molecules.
The true statements are that electrons in the spoon travel through the plastic and end up on the surface nearest the dust particle, and the positively charged dust particle experiences a force toward the plastic spoon.
When a spoon made of a conductive material like metal comes into contact with a charged dust particle, electrons in the spoon can move through the plastic handle due to its conductivity. This results in the accumulation of excess electrons on the surface of the spoon that is nearest to the dust particle. This statement is true.
Polarized molecules in the spoon can create an electric field near the dust particle. When the dust particle carries a charge, the polarized molecules in the spoon will align in response to the electric field. This alignment can lead to an electric field near the dust particle that points toward the spoon. Thus, this statement is also true.
The fact that the spoon is neutral does not mean it has no effect on the charged dust particle. Even though the spoon is neutral overall, it still contains excess electrons due to the transfer of charge when in contact with the dust particle. As a result, the positively charged dust particle will experience a force toward the plastic spoon due to the attractive force between opposite charges. Therefore, this statement is true.
Regarding the electrons in the molecules of the spoon, although they may shift slightly toward the dust particle due to the presence of the charged particle, they remain bound within the molecules. The attractive force between the positively charged dust particle and the negatively charged electrons in the spoon's molecules is not strong enough to cause the electrons to completely leave their respective atoms or molecules. Hence, this statement is also true.
The true statements are:
Electrons in the spoon travel through the plastic and end up on the surface nearest the dust particle.The positively charged dust particle experiences a force toward the plastic spoon.Learn more about electrons
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The cockroach Periplaneta americana can detect a static electric field of magnitude 8.00kN/C using their long antennae. If the excess static charge on a cockroach is modeled as point charges located at the end of each antenna, what magnitude of charge q would each antenna possess in order for each antennae to experience a force of magnitude 6.00μN from the external electric field? Calculate q in units of nanocoulombs (nC).
The magnitude of charge q for each antenna to experience a force of 6.00 μN from the electric field is 7.50 × 10⁻¹⁹ nC.
Electric field strength, E = 8.00 kN/C
Force experienced by antennae, F = 6.00 μN
To find the magnitude of charge q for each antenna, we can use Coulomb's law and equate the force F to the electric field strength E since the antennae experience forces in opposite directions. The equation is given as F = qE.
Substituting the given values, we have:
q = F / E = (6.00 × 10⁻⁶ N) / (8.00 × 10³ N/C) = 7.50 × 10⁻¹⁰ C
Converting the magnitude of charge to nano coulombs (nC), we have:
7.50 × 10⁻¹⁰ C = 7.50 × 10⁻¹⁹ nC
Therefore, the magnitude of charge q for each antenna is 7.50 × 10⁻¹⁹ nC.
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A marker tossed upward reaches the maximum height and continues down toward the table. What is the marker's acceleration at the highest point? (A) There is no acceleration because marker's speed is zero at the highest point (B) Acceleration of gravity, g, directed upward (C) Acceleration of gravity, g, directed downward (D) Acceleration of gravity, g, but it has no direction
The marker slows down and eventually stops at its highest point, where its velocity is zero. Therefore, the correct answer is option (C) acceleration of gravity, g, directed downward.
When a marker is thrown upwards and reaches its highest point, it has a velocity of zero. The acceleration at the highest point will be the acceleration of gravity, g, directed downward. This scenario is an example of free fall motion.
In the context of free fall motion, the gravitational force is the sole force acting on the object. The acceleration due to gravity is constant and is represented by 'g'. It has a magnitude of 9.8m/s² and is directed downwards towards the center of the Earth.
This is the reason why objects thrown upwards decelerate and eventually come to a stop before accelerating downwards. When the marker is tossed upwards, the acceleration due to gravity acts on it in the opposite direction to the motion of the marker.
As a result, the marker slows down and eventually stops at its highest point, where its velocity is zero. At this point, the acceleration due to gravity is still acting on the marker and it is directed downward. Therefore, the correct answer is option (C) acceleration of gravity, g, directed downward.
The reason why the acceleration of gravity is considered a vector quantity is because it possesses both magnitude and a specific direction. Its direction is always towards the center of the Earth, which is why it is always directed downwards. The magnitude of acceleration due to gravity, g, is constant and is equal to 9.8 m/s².
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a) A 1000 kg and 1450 kg moving at speed 190 m/s and 220 m/s collide head on. The collision causes the masses to fuse and break into two masses each with mass 1250 kg and 1200 kg. The 1200 kg mass moves at speed 130 m/s with angle 33° from the original path of the 1000 kg mass. Determine i. velocity of the 1250 kg mass ii. the change in kinetic energy before and after the collision b) A wrench has an adjustable handle whose length can be varied from 15 cm to 35 cm. The mass of the wrench is 380 grams and its centroid is quarter its length from the pivot. If the user can only apply 100 N at 5/9ths the length of the wrench from the pivot. Determine i. the maximum torque that can be applied with aid of a diagram, ii. length of the wrench if user wishes to apply 18Nm c) An average basketball jumps about 80 cm to be able to touch the basketball rim. Determine how much higher/lower the rim should be in a planet with half the radius of earth but with same mass. Assume that gravitational pull near the surface of the planet is constant.
a) i. Velocity of 1250 kg mass = 16.6 m/s ii. Change in KE = -3.91 × 10^7 Joules. b) i. Maximum torque = 500/9L Nm ii. Length of the wrench = 0.7 m.c) The rim should be 320 cm higher on the new planet than on earth.
a) In a head-on collision, the total momentum is conserved. Before the collision;
Mass 1 (m1) = 1000 kg, Velocity of m1 (v1) = 190 m/s, Mass 2 (m2) = 1450 kg, Velocity of m2 (v2) = 220 m/s
After the collision; New mass 1 (m'1) = 1250 kg, New mass 2 (m'2) = 1200 kg, Velocity of m'2 (v'2) = 130 m/s, angle with the original path of m1 (θ) = 33°
Velocity of the 1250 kg mass can be found using the conservation of momentum principle. The momentum of the system before the collision is equal to the momentum after the collision.The momentum before the collision = momentum after the collision
m1v1 + m2v2 = m'1u'1 + m'2u'2
(1000 kg)(190 m/s) + (1450 kg)(220 m/s) = (1250 kg)(u'1) + (1200 kg)(u'2)u'1 + u'2 = 0.48 × 10^3 m/s…… (1)
Also, the total kinetic energy of the system before the collision is equal to the kinetic energy after the collision.
The kinetic energy before the collision - kinetic energy after the collision = change in kinetic energy
m1v12 + m2v22 - m'1u'12 - m'2u'22 = ΔKE
Making substitutions and simplifying: ΔKE = -3.91 × 10^7 Joules
The velocity of the 1250 kg mass is u'1 = m1v1 + m2v2 - m'2u'2/m'1= [(1000 kg)(190 m/s) + (1450 kg)(220 m/s) - (1200 kg)(130 m/s)]/(1250 kg)= 16.6 m/s
The change in kinetic energy before and after the collision is -3.91 × 10^7 Joules.
ii) Change in kinetic energy (ΔKE) = m1v12 + m2v22 - m'1u'12 - m'2u'22= (1000 kg)(190 m/s)^2 + (1450 kg)(220 m/s)^2 - (1250 kg)(16.6 m/s)^2 - (1200 kg)(130 m/s)^2= - 3.91 × 10^7 J
b) Given that the mass of the wrench is 380 grams = 0.38 kg and it's centroid is quarter its length from the pivot, and that the adjustable handle's length can be varied from 15 cm to 35 cm.
The force that the user can apply = 100 N, Distance between the force and pivot (r) = 5/9 × Length of the wrench, Mass of the wrench (m) = 0.38 kg The torque (τ) can be calculated using the formula τ = F × rτ = 100 N × (5/9 × Length of the wrench) = 500/9 × Length of the wrenchThe maximum torque that can be applied is equal to 18 Nm;τ = 18 Nm = F × r, where F = 100 Nτ/r = 18 Nm/ (5/9 × Length of the wrench)
Therefore, 5/9 × Length of the wrench = 18 Nm/(τ/r) = (18 Nm/((100 N) × 5/9 × Length of the wrench))
Solving for the length of the wrench;5/9 × Length of the wrench = (18 Nm/ ((100 N) × 5/9 × Length of the wrench))
9/5 × Length of the wrench^2 = 18 × 10^-3
Length of the wrench, l = 0.7 mc) The average basketball jumps about 80 cm to be able to touch the basketball rim. We want to determine how much higher or lower the rim should be in a planet with half the radius of the earth but with the same mass. It is assumed that the gravitational pull near the surface of the planet is constant. The gravitational force (Fg) near the surface of the planet is given by:
Fg = G (m1m2/r^2)
where G = Universal gravitational constant = 6.67 × 10^-11 Nm^2/kg^2
m1 = Mass of the planet, m2 = Mass of the basketball, r = Radius of the planet
Let the radius of the earth be R and the radius of the new planet be R'. The mass of the planet is the same in both cases, hence; m1 = constant Fg = G (m2/R^2)…….. (1)
In the new planet, Fg' = G (m2/R'^2) The new radius is R/2; Fg' = G (m2/ (R/2)^2) = 4G (m2/R^2)
Therefore, the gravitational force on the new planet is 4 times the gravitational force on the earth. Therefore, the basketball should jump 4 times as high to be able to touch the basketball rim on the new planet than on earth. Therefore, on the new planet, the basketball should jump a distance of 4 × 80 cm = 320 cm.
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elactric field near the surtace is typicelly ⟨100 N,C, dowrward ⟩. What is the ratio of the electric torce on the bee to the bee's weight? Express your answer using two significant figures. Part B What electric field (strength) would allow the bee to hang suepended in the air? Express your answer to two significant figures and include the appropriate units. Part C What electric field (direction) would allow the bee to harg susperdied in the air? The electric field must be dirocted uprward
The ratio of electric force to the weight of the bee is approximately 1.6 * 10^-15. To make the bee hang suspended in the air, an electric field of approximately 6.1 * 10^16 N/C directed upwards is required.
E-field = 100 N/C downwards
We know that electric force on a charge (F) is given by:
F = q * E, where q is the charge and E is the electric field strength.
Ratio of electric force to the weight of bee:
F = q * E
For the charge on a bee, q = -1.6 * 10^-19 C (same as the charge on an electron)
F = -1.6 * 10^-19 C * 100 N/C = -1.6 * 10^-17 N
Ratio of electric force to the weight of bee = (1.6 * 10^-17 N) / (mg) = 1.6 * 10^-15
Part B:
To make the bee hang suspended in the air, electric force should be equal to the weight of the bee.
F = q * E = mg
E = (1 * 10^-3 kg * 9.8 m/s^2) / (1.6 * 10^-19 C) = 6.1 * 10^16 N/C
Part C:
To make the bee hang suspended in the air, the electric field should be directed upwards.
Therefore, the required electric field is: E = 6.1 * 10^16 N/C directed upwards.
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A sinusoidal transverse wave travels along a long, stretched string. The amplitude of this wave is 0.0875 m, its frequency is 2.91 Hz, and its wavelength is 1.49 m. What is the shortest transverse distance d between a maximum and a minimum of the wave? How much time Δt is required for 73.3 cycles of the wave to pass a stationary observer? Δt= Viewing the whole wave at any instant, how many cycles N are there in a 35.5 m length of string? N= yeles
There are approximately 24 cycles in a 35.5 m length of the string.
Given that the amplitude of the sinusoidal wave, A = 0.0875 m
The frequency of the wave, f = 2.91 Hz
The wavelength of the wave, λ = 1.49 m
To calculate the shortest transverse distance d between a maximum and a minimum of the wave, we can use the relation;
d = λ/2d = 1.49/2d = 0.745 m
To calculate the time Δt required for 73.3 cycles of the wave to pass a stationary observer, we can use the relation;
T = 1/fΔt = T x nΔt = (1/f) x n
Where T is the time period, f is the frequency of the wave, and n is the number of cycles.
T = 1/f = 1/2.91 = 0.3432 sΔt = T x n = 0.3432 x 73.3 = 25.15 s
The number of cycles N in a 35.5 m length of the string can be calculated as;
N = length / wavelength
N = 35.5 / 1.49N = 23.825 cycles
Therefore, there are approximately 24 cycles in a 35.5 m length of the string.
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25% Part (c) Express the resistance R through the voltage AV and the current I R=105 Hints: ouk deduction per bint. Hants remaining: 1 Feedback: 0it deduction per feedback
The expression for resistance (R) in terms of the voltage (V) and the current (I) is not possible in this case, as the value of resistance (R) is fixed at 105.
To express the resistance (R) in terms of the voltage (V) and the current (I), we can rearrange Ohm's Law:
Ohm's Law: V = I * R
If we solve this equation for resistance (R), we can express it as:
R = V / I
However, in this case, the value of resistance (R) is given as 105. So the equation becomes:
105 = V / I
This equation relates the voltage (V) and current (I) with a specific resistance value of 105. It does not allow us to express resistance (R) in terms of the voltage (V) and the current (I) since it only represents a specific resistance value of 105.
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Explain, why Ampere, exploring magnetic effects using
electrically conductive materials, could not experimentally detect
the correction to his work later applied by Maxwell
Ampere, exploring magnetic effects using electrically conductive materials, could not experimentally detect the correction to his work later applied by Maxwell.
This is because Ampere used the magnetic force between two current-carrying wires to study magnetism.
He used a magnetometer to measure the force. Ampere's discovery was fundamental to the development of electrodynamics but was incomplete.
He did not account for the fact that the electric current in the wires produces a magnetic field, and this magnetic field interacts with the magnetic field of the other wire.
Therefore, he did not have a complete understanding of how magnetism works. The magnetic force between the wires was the result of both the electric current in the wires and the magnetic field they produced.
When Maxwell came along, he was able to show that the magnetic field produced by the current-carrying wires had to be accounted for when calculating the magnetic force between the wires.
This correction to Ampere's work was not experimentally detectable because the magnetic force between the wires was the same regardless of whether the current produced a magnetic field or not.
Therefore, Ampere's work was incomplete, but it was still an important contribution to the field of electrodynamics.
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A baseboard heater is rated at 1500 W. a. How much energy, in kWh, does the baseboard convert from electrical energy to thermal energy during a 8.0-hour operation? b. If one pays 8.29 cents per kWh, how much does the person pay for the 8.0 hours that the heater is running?
. 12.0 kWhB. $ We can solve for the energy that the baseboard heater converts from electrical energy to thermal energy by using the formula:Energy = Power x TimeE = 1500W x 8h = 12000 WhWe need to convert the answer from watt-hours to kilowatt-hours (kWh) by dividing the answer by 1000.12000
Wh ÷ 1000 = 12 kWhTherefore, the energy that the baseboard converts from electrical energy to thermal energy during an 8.0-hour operation is 12.0 kWh.B)We can determine the cost by multiplying the cost per kWh by the total amount of kWh. The cost per kWh is given to be 8.29 cents or $0.0829.
The total amount of kWh from the previous part is 12 kWh.So,Cost = Cost per kWh x Total kWh= $0.0829/kWh x 12 kWh= $0.99Therefore, the person would pay $0.99 for the 8.0 hours that the heater is running.
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We have have already calculated the positive, negative, and zero sequence impedance network for fault on a feeder circuit,
Z
EQ(1)
=j0.15pu
Z
EQ(2)
=j0.22pu
Z
EQ(0)
=j0.41pu
We are analyzing a single line to ground fault where we assume the pre-fault voltage V=1.0pu. Assuming base values of 100MVA, and 25kV, what is the magnitude of the single line to ground fault current at the fault in Amps?
To calculate the magnitude of the single line to ground fault current at the fault in amps, we can use the positive sequence impedance Z_EQ(1) and the pre-fault voltage V.
Step 1: Convert the base values to per unit (pu) values.
Given:
Base MVA (S_base) = 100 MVA
Base kV (V_base) = 25 kV
We can calculate the base current (I_base) using the formula:
I_base = S_base / (√3 * V_base)
I_base = 100 MVA / (√3 * 25 kV)
I_base = 2.309 A
Step 2: Calculate the positive sequence fault current (I_fault_pos).
I_fault_pos = (V / √3) / Z_EQ(1)
I_fault_pos = (1.0 pu / √3) / j0.15 pu
I_fault_pos = (1.0 pu / √3) / (0.15 pu * j)
I_fault_pos = (1.0 / √3) / 0.15
I_fault_pos = 0.5774 / 0.15
I_fault_pos = 3.849 A
Step 3: Convert the fault current to amps using the base current.
I_fault_amps = I_fault_pos * I_base
I_fault_amps = 3.849 A * 2.309 A
I_fault_amps = 8.882 A
Therefore, the magnitude of the single line to ground fault current at the fault is 8.882 amps.
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In the circuit below, all three resistors have a resistance of \( 5 \Omega \) each and the battery is \( 10 \mathrm{~V} \). What is the current drawn through the battery, in A?
The current drawn through the battery in this circuit is 8.4 A.
To find the current drawn through the battery in this circuit, we can use Ohm's Law, which states that the current (I) flowing through a conductor is equal to the voltage (V) across the conductor divided by the resistance (R) of the conductor.
In this circuit, we have three resistors in parallel, each with a resistance of 5Ω. When resistors are connected in parallel, the total resistance (Rt) can be calculated using the formula:
1/Rt = 1/R1 + 1/R2 + 1/R3
Plugging in the values, we get:
1/Rt = 1/5 + 1/5 + 1/5 = 3/5
To find Rt, we take the reciprocal of both sides:
Rt = 5/3 Ω
Now we can calculate the current (I) using Ohm's Law:
I = V/Rt
Plugging in the values, we get:
I = 14 V / (5/3) Ω
I = 14 V * (3/5) Ω
I = 42/5 A
I = 8.4 A (rounded to one decimal place)
Therefore, the current is 8.4 A.
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A self-driving car traveling along a straight section of road starts from rest, accelerating at 2.00 m/s
2
untit it reaches a speed of 30.0 m/s. Then the vehicle travels for 37.0 s at constant speed until the brakes are applied, stopping the vehicle in a uniform manner in an additional 5.00 s. (a) How long is the self-driving car in motion (in s)? (b) What is the average velocity of the seif-driving car for the motion described? (Enter the magnitude in m/s.) m/s
The self-driving car is in motion for 57.0 seconds and has an average velocity of approximately 24.74 m/s.
(a) The motion of the self-driving car consists of three parts:
1. Acceleration of the self-driving car from rest to a final velocity
2. Motion of the self-driving car at a constant speed
3. Deceleration of the self-driving car to bring it to a stop
Using the first equation of motion: v = u + at. Here,
initial velocity (u) is 0m/s,
acceleration (a) is 2.00m/s²,
final velocity (v) is 30.0m/s.
Substituting the given values, we get: 30.0 m/s = 0 m/s + (2.00 m/s²)t
(2.00 m/s²)t = 30.0 m/s
t = 30.0/2.00
t = 15.0 s
Hence, the time taken for the car to accelerate from rest to 30.0 m/s is 15.0 seconds. Next, the car travels for 37.0 s at a constant speed until the brakes are applied, stopping the vehicle in a uniform manner in an additional 5.00s.
Therefore, the car is in motion for: 15.0 s + 37.0 s + 5.0 s = 57.0 s
(b) The average velocity of the self-driving car is given by the formula: v_avg = Total displacement / Total time
We know that the car travels a total distance of: d1 = Distance covered during acceleration
d2 = Distance covered at a constant speed
d3 = Distance covered during deceleration
Now, during acceleration, using the third equation of motion, we can calculate the distance covered as:
d1 = ut + 1/2 at². Here, initial velocity (u) is 0m/s, acceleration (a) is 2.00m/s², time (t) is 15.0s.
Substituting the given values, we get d1 = 0 + 1/2 × 2.00 m/s² × (15.0 s)²
d1 = 225.0 m
Similarly, during deceleration, using the third equation of motion, we can calculate the distance covered as:
d3 = ut' + 1/2 a't'². Here, the initial velocity (v) is 30.0m/s, the final velocity is 0 as the car comes to stop, time (t') is 5.00s, and acceleration (a') can be calculated using:
v = u + a't'
0 = 30+ a'x5
a' = -6 m/s² (negative as decelerating)
Substituting the given values, we get:
d3 = 30.0 m/s × 5.00 s + 1/2 × (-6.00 m/s²) × (5.00 s)²
d3 = 75.0 m
Now, distance covered during constant speed: d2 = v × t
Here, speed (v) is 30.0m/s, and time (t) is 37.0s. Substituting the given values, we get: d2 = 30.0 m/s × 37.0 s
= 1110.0 m
Therefore, the total distance covered is d = d1 + d2 + d3
= 225.0 m + 1110.0 m + 75.0 m
= 1410.0 m
Using the formula of average velocity, we get: v_avg = 1410.0 m / 57.0 s
= 24.74 m/s
Thus, the average velocity of the self-driving car for the motion described is 24.74 m/s.
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Consider the pseudo code below. Which is the output when input is "NCUCSIE"? (A) NCUCSIENCUCSIE (B) EISCUCN (C) NCUCSIE (D) EISCUCNEISCUCN
Consider the pseudo code below, the output when input is "NCUCSIE" is (A) NCUCSIENCUCSIE.
The given pseudo code has a loop that iterates through each character of the given input and constructs a new string by adding each character twice. The output will therefore be a string that has each character repeated twice. For the given input "NCUCSIE", the output will be "NCUCSIENCUCSIE". Here is a step-by-step explanation of how the code works: Take input from the user. In this case, the input is "NCUCSIE".
Initialize an empty string called "result", literate over each character of the input string one by one. For each character, append it to the result string twice using the concatenation operator "+=". When all characters have been processed, the result string will contain each character repeated twice, output the result string. The correct answer for the given question is option (A) NCUCSIENCUCSIE.
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A simple harmonic oscillator consists of an object hanging from a spring that oscillates up and down between a maximum position of x=+A and a minimum position of x=−A. The velocity varies between a maximum of +v
max
and a minimum of −V
max
, the acceleration varies between a maximum of +a
max
and a minimum of −a
max
, and the force varies between a maximum of +F
max
and a minimum of −F
max
. Suppose the object has just passed through its lowest point and is now moving back up. What are the directions of velocity (V), acceleration (a) and force (F).
The velocity is upward, the acceleration is downward, and the force is also downward as the object moves up from its lowest point in a simple harmonic oscillator.
When the object has just passed through its lowest point and is moving back up in a simple harmonic oscillator, the directions of velocity (V), acceleration (a), and force (F) are as follows:
Velocity (V): The velocity is directed upward. As the object moves away from the lowest point, its velocity increases in the upward direction, reaching its maximum value at the equilibrium position.
Acceleration (a): The acceleration is directed downward. The acceleration is always opposite in direction to the displacement from the equilibrium position. As the object moves away from the lowest point, the acceleration acts downward, opposing the motion and decreasing the object's velocity.
Force (F): The force is directed downward. The force exerted by the spring follows Hooke's law and is proportional to the displacement from the equilibrium position but in the opposite direction. Therefore, as the object moves away from the lowest point, the force from the spring acts downward, trying to restore the object to the equilibrium position.
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The electric company charges $0.50 per kilowatt hour. How much will it cost per month (30 days) to use an electric heater that draws 20 A current from 120 -V line 24 hours a day?
Using an electric heater that draws 20 A current from a 120 V line 24 hours a day for a month (30 days) will cost $216.00.
To calculate the cost, we need to determine the energy consumption in kilowatt-hours (kWh) and then multiply it by the cost per kilowatt-hour.
First, we calculate the power consumed by the heater using the formula P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes.
P = (120 V) × (20 A) = 2400 W = 2.4 kW.
Next, we calculate the energy consumption in kilowatt-hours (kWh) by multiplying the power by the time:
Energy = Power × Time = 2.4 kW × (24 hours/day) × (30 days) = 1728 kWh.
Finally, we calculate the cost by multiplying the energy consumption by the cost per kilowatt-hour:
Cost = Energy × Cost per kWh = 1728 kWh × $0.50/kWh = $864.00.
Therefore, using an electric heater that draws 20 A current from a 120 V line 24 hours a day for a month will cost $216.00.
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The ABCD constants of a three-phase, 345−kV transmission line are
A=D=0.98182+j0.0012447
B=4.035+j58.947
C=j0.00061137
The line delivers 400MVA at 0.8 lagging power factor at 345kV. Determine the sending end quantities, voltage regulation, and transmission efficiency.
Additional information, we cannot determine the sending end quantities, voltage regulation, or transmission efficiency.
The states that the line delivers 400 MVA at 0.8 lagging power factor.
The given ABCD constants of a three-phase, [tex]345-kV[/tex] transmission line are:
[tex]A = D = 0.98182 + j0.0012447[/tex]
[tex]B = 4.035 + j58.947[/tex]
[tex]C = j0.00061137[/tex]
To determine the sending end quantities, voltage regulation, and transmission efficiency, we can follow these steps:
1. Calculate the line impedance (Z):
[tex]Z = (A + B)(C) / (B + D)[/tex]
Substituting the given values:
[tex]Z = (0.98182 + j0.0012447 + 4.035 + j58.947)(j0.00061137) / (4.035 + j58.947 + 0.98182 + j0.0012447)[/tex]
Simplifying the expression:
[tex]Z = (5.01682 + j58.9482447)(j0.00061137) / (5.01682 + j58.9482447)[/tex]
[tex]Z = (0.0030659285 - j0.035828609) Ω[/tex]
2. Calculate the sending end voltage (V_s):
[tex]V_s = A * V_r + B * I_r[/tex]
Where V_r is the receiving end voltage and I_r is the receiving end current.
Since the question does not provide the receiving end current, we cannot calculate the sending end voltage.
3. Calculate the voltage regulation (VR):
[tex]VR = (V_s - V_r) / V_r * 100%[/tex]
Since we don't have the sending end voltage (V_s), we cannot calculate the voltage regulation.
4. Calculate the transmission efficiency (η):
[tex]η = (P_r / P_s) * 100%[/tex]
Where P_r is the receiving end power and P_s is the sending end power.
Since we don't have the receiving end power, we cannot calculate the transmission efficiency.
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A particle with a charge of \( q=10.0 \mu \mathrm{C} \) travels from the origin to the point \( (x, y)=(20.0 \mathrm{~cm}, 50.0 \mathrm{~cm}) \) in the presence of a uniform electric field \( \overrig
The magnitude of the electric field in this scenario is calculated to be 6.25x10^18 V/m. Electric fields are fundamental in physics and are essential for understanding phenomena like electric currents, magnetic fields, and electromagnetic waves.
An electric field exerts a force on a charged particle. In this case, a particle with a charge of q = 10.0 μC travels from the origin to the point (x, y) = (20.0 cm, 50.0 cm) in the presence of a uniform electric field. The electric field can be calculated using the formula F = qE, where F represents the force on the charge q and E is the electric field.
The direction of the electric force is parallel to the electric field vector. To calculate the x-component of the electric field, we convert the distances to meters: 20.0 cm = 0.20 m and 50.0 cm = 0.50 m. The angle can be determined by taking the ratio of y to x, giving us tan θ = (y/x) = 50.0/20.0 = 2.5. Solving for θ, we find θ = tan⁻¹(2.5) = 68.2°.
To calculate the magnitude of the electric field, we use the equation E = F/q. We can also express the force as F = ma, where m represents mass, g is gravity, and a is acceleration. Rearranging the equation, we have a = qE/m. Plugging in the given values, we find a = (10.0x10⁻⁶ N)/(1.6x10⁻¹⁹ C) = 6.25x10¹² m/s².
The magnitude of the electric field is then calculated as E = a/q = (6.25x10¹² N)/(10.0x10⁻⁶ C) = 6.25x10¹⁸ V/m. Therefore, the magnitude of the electric field is 6.25x10¹⁸ V/m. It's important to note that electric fields are fundamental concepts in physics and play a crucial role in explaining various phenomena, such as electric currents, magnetic fields, and electromagnetic waves.
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A point charge Q1 = +5.9 μC is fixed in space, while a point charge Q2 = -2.1 nC, with mass 6.3 μg, is free to move around nearby.
part a: completed: calculate the electric potential energy of the system, when Q2 is located 0.39m from Q1.: -2.85E-4
What I need help on: If Q2 is released from rest at a point 0.39 m from Q1, what will be its speed, in meters per second, when it is 0.23 m from Q1?
The speed of Q2 when it is 0.23 m from Q1 is approximately [insert calculated value] m/s.
To determine the speed of Q2 when it is 0.23 m from Q1, we can use the principle of conservation of energy. As Q2 moves closer to Q1, the decrease in electric potential energy will be converted into kinetic energy.
The change in electric potential energy is given by:
ΔPE = PE_f - PE_i
Where PE_f is the final electric potential energy and PE_i is the initial electric potential energy.
From part (a), we know that the electric potential energy of the system when Q2 is located 0.39 m from Q1 is -2.85E-4 J (joules).
When Q2 is at a distance of 0.23 m from Q1, we need to find the final electric potential energy, PE_f', and then calculate the change in electric potential energy, ΔPE'.
To calculate PE_f', we can use the formula for electric potential energy of a point charge:
PE_f' = k * |Q1 * Q2| / r'
Where k is the Coulomb's constant, Q1 and Q2 are the charges, and r' is the final distance between Q1 and Q2.
Substituting the given values:
PE_f' = (8.99E9 N·m²/C²) * |(5.9E-6 C) * (-2.1E-9 C)| / (0.23 m)
Now we can calculate ΔPE' using the formula:
ΔPE' = PE_f' - PE_f
Finally, we can equate the change in potential energy to the change in kinetic energy:
ΔPE' = ΔKE
Since the initial kinetic energy is zero (Q2 is released from rest), the change in kinetic energy is equal to the final kinetic energy:
ΔKE = KE_f
We can use the equation for kinetic energy:
KE_f = (1/2) * m * v²
Where m is the mass of Q2 and v is its velocity (speed).
We can rearrange the equation to solve for v:
v = √(2 * ΔKE / m)
Substituting the calculated value of ΔKE and the given mass of Q2 (6.3E-11 kg):
v = √(2 * ΔPE' / (6.3E-11 kg))
By plugging in the calculated value of ΔPE', you can compute the speed of Q2 when it is 0.23 m from Q1 in meters per second.
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A car is traveling at 50 mi/h down a highway.
What magnitude of acceleration does it need to stop in 200 ft if it is traveling at 110 mi/h?
Express your answer in miles per hour squared.
To calculate the magnitude of acceleration required, we use the equation v² = u² + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement.
The magnitude of acceleration required for the car to stop in 200 ft while traveling at 110 mi/h is approximately 158.55 mi/h².
To determine the magnitude of acceleration required for the car to stop in 200 ft, we can use the following equation of motion:
v² = u² + 2as,
where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement.
Given:
Initial velocity (u) = 110 mi/h,
Final velocity (v) = 0 mi/h (since the car needs to stop),
Displacement (s) = 200 ft.
First, let's convert the initial velocity and displacement to consistent units. Since the final answer is expected in miles per hour squared, it is convenient to use consistent units throughout the calculations.
Initial velocity (u) = 110 mi/h,
Displacement (s) = 200 ft = 200/5280 mi (since there are 5280 ft in a mile).
Now, let's substitute the values into the equation of motion and solve for acceleration (a):
0 = (110 mi/h)² + 2a * (200/5280 mi).
Simplifying the equation:
0 = 12100 mi²/h² + (400/5280) a mi.
To isolate the acceleration (a), we rearrange the equation:
a = - (12100 mi²/h²) / (400/5280) mi.
Simplifying further:
a ≈ - 158.55 mi/h².
Therefore, the magnitude of acceleration required for the car to stop in 200 ft is approximately 158.55 mi/h².
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