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Exam 9: Linear Momentum and Collisions

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Question 41

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A 0.140-kg baseball is dropped from rest from a height of 2.20 m above the ground and experiences negligible air resistance as it falls.It rebounds to a height of 1.60 m.What change in the ball's momentum occurs as it rebounds from the ground?

A) 0.117 kg ∙ m/s upwards
B) 0.117 kg ∙ m/s downwards
C) 1.70 kg ∙ m/s upwards
D) 0.350 kg ∙ m/s upwards
E) 0.350 kg ∙ m/s downwards

F) B) and E)
G) None of the above

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Question 42

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A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces.It rebounds with an upward velocity of 1.00 m/s.What is the change of the ball's momentum during the bounce?

A) 0.0280 kg ∙ m/s upwards
B) 0.0280 kg ∙ m/s downwards
C) 0.308 kg ∙ m/s upwards
D) 0.308 kg ∙ m/s downwards
E) 0.000 kg ∙ m/s

F) A) and D)
G) C) and D)

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Question 43

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A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s².It takes it 0.0655 s to reach the ground.What is the magnitude of its momentum just before it hits the ground?

Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake.The person in the front throws a very massive ball toward the back,and the person in the back catches it.After the ball is caught,the canoe is

A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart.What is the speed of the 270-g cart just after the collision?

In the figure,determine the character of the collision.The masses of the blocks,and the velocities before and after,are shown.The collision is

A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south.The two cars stick together after the collision.What is the direction of motion of the cars after collision?

A 0.140-kg baseball is dropped from rest.It has a speed of 1.20 m/s just before it hits the ground,and it rebounds with an upward speed of 1.00 m/s.The ball is in contact with the ground for 0.0140 s.What is the average force exerted by the ground on the ball during the time of contact?

If a quantity you calculated had units of kg ∙ m/s,what type of quantity could it be? (There could be more than one correct choice. )

A dinner plate falls vertically to the floor and breaks up into three pieces,which slide horizontally along the floor.Immediately after the impact,a 200-g piece moves along the +x-axis with a speed of 2.00 m/s,a 235-g piece moves along the +y-axis with a speed of 1.50 m/s.The third piece has a mass of 100 g.What is the speed of the third piece?

A firecracker breaks up into two pieces,one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s.The second piece has a mass of 300 g and flies off along the +y-axis with a speed of 45.0 m/s.What is the total momentum of the two pieces?

A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface.A crane suddenly drops 858 kg. Of ore vertically into the cart.How fast does the cart move just after being loaded with the ore?

A fire hose is turned on the door of a burning building in order to knock the door down.This requires a force of 1000 N.If the hose delivers 40 kg of water per second,what is the minimum velocity of the stream needed to knock down the door,assuming the water doesn't bounce back?

The graph in the figure shows the x component F of the net force that acts for 10 s on a 100-kg crate.What is the change in the momentum of the crate during the 10 s that this force acts?

Two simple pendulums of equal length l = 0.45 m are suspended from the same point.The pendulum bobs are small solid steel spheres.The first bob is drawn back to make a 35° angle with the vertical,while the other one is left hanging at rest.If the first bob has a mass of 0.25 kg and the second has a mass of How high will the second bob rise above its initial position when struck elastically by the first bob after it is released?

The momentum of an isolated system is conserved

A dinner plate falls vertically to the floor and breaks up into three pieces,which slide horizontally along the floor.Immediately after the impact,a 320-g piece moves along the +x-axis with a speed of 2.00 m/s and a 355-g piece moves along the +y-axis with a speed of 1.50 m/s.The third piece has a mass of 100 g.In what direction relative to the +x-axis does the third piece move?

A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall.The ball strikes the wall horizontally with a speed of And it bounces back with this same speed.The ball is in contact with the wall What is the magnitude of the average force exerted on the wall by the ball?

A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v.If the collision is perfectly elastic,what speed will the alpha particle have after the collision? (Assume the neutron's mass is equal to the proton's mass. )

A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g.If the collision is perfectly elastic,what is the velocity of each ball immediately after the collision?