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Exam 9: Linear Momentum and Collisions

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Question 1

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A block of mass m = 5.6 kg,moving on a frictionless surface with a velocity of v_i=6.5m/s. To the right,collides with a block of mass M at rest,as shown in the figure.After the collision,the 5.6-kg block recoils with a velocity of v_f= 0.70m/s. To the left. If the blocks are in contact for 0.20 s,what is the magnitude of the average force on the 5.6-kg block,while the two blocks are in contact?

A) 202 N
B) 192 N
C) 182 N
D) 0.N
E) 0 N

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Question 2

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Three cars,car X,car Y,and car Z,begin accelerating from rest at the same time.Car X is more massive than car Y,which is more massive than car Z.The net accelerating force exerted on each car is identical.After 10 seconds,which car has the most amount of momentum?

A) They all have the same amount of momentum.
B) Car X
C) Car Y
D) Car Z

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Question 3

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In a collision between two unequal masses,which mass receives a greater magnitude impulse?

A 1200-kg car moving at 15.6 m/ s. Suddenly collides with a stationary car of mass 1500 kg. If the two vehicles lock together,what is their combined velocity immediately after the collision?

A small car meshes with a large truck in a head-on collision.Which of the following statements concerning the magnitude of the average force during the collision is correct?

A batter hits a foul ball.The 0.14-kg baseball that was approaching him at 40 m/s leaves the bat at 30 m/s in a direction perpendicular to the line between the batter and the pitcher.What is the magnitude of the impulse delivered to the baseball?

A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east.The two vehicles stick together and slide along the road after colliding.A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m,at an angle of 50° south of east,from the point of impact.She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40.What was the speed of the car just before the collision?

A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s.The cars stick together after the collision.What is the speed of the wreckage just after the collision?

A railroad car collides with and sticks to an identical railroad car that is initially at rest.After the collision,the kinetic energy of the system

In a certain nuclear reactor,neutrons suddenly collide with carbon nuclei,which have 12 times the mass of neutrons.In a head-on elastic collision with a stationary carbon nucleus,what fraction of its initial speed does the neutron have 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 very light ping-pong ball moving east at a speed of 4 m/s collides with a very heavy stationary bowling ball.The Ping-Pong ball bounces back to the west,and the bowling ball moves very slowly to the east.Which object experiences the greater magnitude impulse during the collision?

A 5-kg ball collides inelastically head-on with a 10-kg ball,which is initially stationary.Which of the following statements is true? (There could be more than one correct choice. )

A rubber ball and a lump of clay have equal mass.They are thrown with equal speed against a wall.The ball bounces back with nearly the same speed with which it hit.The clay sticks to the wall.Which one of these objects experiences the greater momentum change?

There must be equal amounts of mass on both sides of the center of mass (or center of gravity)of a system.

A 340-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 300-g cart.What is the speed of the 300-g cart just after the collision?

Two astronauts,of masses 60 kg and 80 kg,are initially right next to each other and at rest in outer space.They suddenly push each other apart.How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?

If you want to double the momentum of a gas molecule,by what factor must you increase its kinetic energy?

An object initially at rest suddenly explodes in two fragments of masses And That move in opposite directions.If the speed of the first fragment is Find the internal energy of the explosion.

A tiger is running in a straight line.If we double both the mass and speed of the tiger,the magnitude of its momentum will increase by what factor?