Exam 9: Linear Momentum and Collisions

On a horizontal frictionless air table,a puck runs into an ideal horizontal spring that is fastened to the table.The puck compresses the spring by 15 cm before coming to rest.During the compression process,which quantities are conserved?

Which of the following quantities are units of impulse? (There could be more than one correct choice. )

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

A block of mass m = 4.4 kg,moving on frictionless surface with a speed v_i = 9.2m/s, Makes a sudden perfectly elastic collision with a second block of mass Mass shown in the figure.The second block is originally at rest.Just after the collision,the 4.4-kg block recoils with a speed of v_f=2.5m/s. What is the mass M of the second block?

A small car meshes with a large truck in a head-on collision.Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice. )

A firecracker explodes in midair and breaks up into many fragments.Which of the following statements are true regarding conditions immediately before and immediately after the explosion? I.The total momentum of the fragments is equal to the original momentum of the firecracker. II.The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.

An 8.0-g bullet is suddenly shot into a 4.0-kg block,at rest on a frictionless horizontal surface,as shown in the figure.The bullet remains lodged in the block.The block then moves against a spring and compresses it by 8.9 cm.The force constant (spring constant)of the spring is What is the magnitude of the impulse on the block (including the bullet inside)due to the spring during the entire time interval during which the block compresses the spring?

A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest.If the collision is perfectly inelastic,what is the speed of the masses just after the collision?

Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded,"floating" 100 m from the mothership.She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship.If she and her spacesuit have a combined mass of 200 kg,how long does it take her to coast back to her spaceship?

A forklift pushes a 100-kg crate,starting from rest,with a horizontal force of magnitude F.The graph in the figure shows the x component of this force as a function of time.What is the instantaneous velocity of the crate at time t = 10 s?

A block of mass m = 9.0 kg and speed V and is behind a block of mass M = 27 kg and speed of As shown int the figure.The surface is frictionless,and the blocks suddenly collide and couple.After the collision,the blocks have a common speed of 0.90 m/s.How much kinetic energy of the blocks is lost due to the collision?

Two ice skaters suddenly push off against one another starting from a stationary position.The 45-kg skater acquires a speed of 0.375 m/s relative to the ice.What speed does the 60-kg skater acquire relative to the ice?

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.What is their separation after the heavier astronaut has moved 12m?

During World War I,Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away.This gun also had a very long barrel.What was the reason for using a long barrel in these guns?