Exam 7: Momentum and Collisions

A 0.280-kg ball makes an elastic head-on collision with a second ball initially at rest.The second ball moves off with one fourth the original speed of the first ball.What is the velocity of the first ball after the collision,in terms of its initial velocity,v?

A rubber ball and a clay ball have identical shapes and masses.Each is thrown horizontally with the same speeds toward identical wooden blocks.The rubber ball bounces off its block,whereas,the clay ball sticks its block.Which ball is more likely to knock its block off balance?

A tennis ball (m = 57 g)falls down and hits the ground with a speed of 15 m/s and rebounds upward with a speed of 6.0m/s.If the collision with the earth occurs during a time interval of 0.31 s,find the average force on the ball.

A tennis ball (m = 57 g)falls down and hits the ground with a speed of 15 m/s and rebounds upward with a speed of 6 m/s.If the collision with the earth occurs during over a time of 0.31 s,find the maximum force on the ball.

A 0.280-kg ball makes an elastic head-on collision with a second ball initially at rest.The second ball moves off with one fourth the original speed of the first ball.The mass of the second ball is

A golf ball bounces to a height of 7.60 m after its second bounce after being dropped onto the sidewalk from a 20.5-m high pedestrian overpass.With what speed did it impact the sidewalk just before its second bounce?

An SUV of mass 2200 kg,moving with a speed of 35 m/s on the highway,passes a car with the mass 1500 kg and a kinetic energy equal to that of the SUV.The ratio of the momentum of the SUV relative to that of the car is

Astronauts are playing baseball on the International Space Station.One astronaut with a mass of 60.0 kg,initially at rest,hits a baseball with a bat.The baseball was initially coming toward the astronaut at 30.0 m/s and after the ball is hit,the ball travels in the opposite direction with a speed of 50.0 m/s.The mass of a baseball is 0.120 kg.The recoil velocity of the astronaut is

A rolling steel ball bearing of mass 27.5 g collides elastically with a small toy car of mass 52.0 g.If after the collision,the car moves at 1.25 m/s to the right,with what speed and direction is the ball bearing rolling afterward?

A golf ball (m = 0.05 kg)and a cannonball (M = 100 kg)collide head-on.Before the collision,the two balls had equal speeds of 30 m/s and opposite directions.After the collision,the speed of the golf ball is approximately

In the movies a person hit by a bullet goes flying back from the momentum of the bullet (typically into a plate-glass window),find the final speed of a 84-kg man just after he is hit by a 44magnum bullet of mass 16 g traveling at a speed of 470 m/s.

Rank the time intervals from least to greatest that are required to stop the following objects using the associated constant forces: (1)A 0.140-kg baseball travelling at 43 m/s using a force of 150 N,(2)A 0.185-kg softball travelling at 35 m/s using a force of 190 N,(3)A 0.162-kg cricket ball travelling at 38 m/s using a force of 170 N,and finally (4)a 0.127-kg hockey puck travelling at 47 m/s using a force of 145 N.

In a collision between a small car and a large truck,which of the following pairs of vectors do NOT occur as an equal and opposite pair?

Morris,who is listed at 215 lbs (97.6 kg),throws a juiced-up medicine ball with a speed of 7.0 m/s toward Mateen,who is standing still but wearing a pair of roller blades.Mateen is listed at 195 lbs.(88.5 kg),while the medicine ball has a mass of about 40 lbs.(18.2 kg).At what speed does Mateen roll away once he catches the ball?

A hockey puck with mass 0.250 kg traveling along a line at 2.5 m/s strikes a stationary puck with the same mass.One puck exits the elastic collision in a direction that is 20 degrees away from the line at a speed of 2.35 m/s.What is the angle with respect to the line in which the second puck travels after the collision?

A basketball with a mass of 0.5 kg is bounced on the floor.Right before impact,it has a speed of 10 m/s,and right after it has 8 m/s.What is the impulse of the collision,and of which type is the collision?

Particle one of mass m initially moves to the right at v.Particle two of mass 4m is initially at rest.After they undergo an elastic collision,particle one moves directly down.What is the final speed of particle one?

The forces shown in the force vs.time graph act on a 1.5-kg particle.If the particle is initially at rest,find the particle's speed at t = 5 s?

A bomb explodes into three pieces of mass m,2m,and 3m.The mass m piece flies into the + x direction.The 2m piece flies in the + y direction.If all pieces fly off with the same velocity,what is the angle of the third piece with respect to the + x axis?

A 1000-kg car is travelling west at 17.0 m/s toward an intersection.A 1500-kg truck is travelling north at 20.0 m/s toward the same intersection.The car and truck collide at the intersection and stick together.What is their speed after the collision?