Exam 7: Linear Momentum

A 1200 kg car is traveling at 4.00 m/s and strikes a wall. The car bounces off the wall with a velocity of 4.00 m/s in the opposite direction. If the car is in contact with the wall for 0.100 seconds, then the magnitude of the impulse on the car is

A 1200 kg car is traveling at 3.0 m/s and strikes a wall. The car bounces off the wall with a velocity of 4.0 m/s in the opposite direction. If the car is in contact with the wall for 0.10 seconds, then the magnitude of the average force of the wall on the car is

A football player leaps at a speed of 3.0 m/s toward a second football player, who is moving at 0.5 m/s toward the first player. The two players collide and then move together at 1.2 m/s. If the player moving originally at 0.5 m/s has a mass of 175 kg, what is the other player's mass?

A 5.00 kg mass is moving at 4.00 m/s 30.0 degrees SOUTH of WEST and a 2.00 kg mass is moving at 3.00 m/s 60.0 degrees SOUTH of EAST. Find the velocity of the center of mass, letting (a) = the east-west component, and (b) = the north-south component.

A 4.00 kg object is moving at 5.00 m/s SOUTH. It strikes a 3.00 kg object that is moving WEST at 2.00 m/s. The collision is perfectly inelastic. The kinetic energy lost in the collision is

A 8.00 kg mass is moving at 5.00 m/s SOUTH and a 6.00 kg mass is moving at 7.00 m/s EAST. Find the velocity of the center of mass, letting (a) = the east-west component, and (b) = the north-south component.

A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHEAST. The total momentum of the system is

A 2.0 kg ball is moving at 4.0 m/s WEST. The momentum of the ball is

A 4.00 kg object is moving at 5.00 m/s EAST. It strikes a 6.00 kg object that is at rest. The objects undergo an elastic collision. The velocity of the 4.00 kg object after the collision is at an angle of 30.0 degrees SOUTH of EAST. The speed of the 4.00 kg mass after the collision is

In an elastic collision, one ball has initial velocity v when it collides head-on with another, much less massive ball, initially at rest. The velocity of the second ball after the collision is approximately equal to

A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving WEST at 2.00 m/s. The objects undergo a perfectly inelastic (stick together) collision. The kinetic energy lost in the collision is

A 4.00 kg object is moving at 5.00 m/s EAST. It strikes a 5.00 kg that is moving WEST at 2.00 m/s. The objects collide elastically and move away in the EAST-WEST direction. The velocity of the 5.00 kg object after the collision is

If the kinetic energy of a ball is doubled, then the momentum is about

A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide perfectly inelastically. If the first puck has a mass equal to half that of the second, what is the angle of their final velocity vector below the +x direction?

A 3.00 kg mass is located at x = 2.0 cm and y = −4.0 cm. A 3.00 kg mass is located at x = −5.0 cm and y = 2.0 cm. A 4.00 kg mass is located at x = −3.0 cm and y = −3.0 cm. Where is the center of mass (x, y)?

The Earth has a mass approximately 80 times that of the Moon. The distance between their centers is on average about 384000 km. How far from the center of the Earth is the center of mass of the Earth-Moon system?

A 10 kg bomb is moving NORTH with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0 kg fragment moving WEST with a speed of 8.0 m/s, a 4.0 kg fragment moving EAST with a speed of 10 m/s, and a third 1.0 kg fragment. What is the velocity of the third fragment?

A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving WEST at 2.00 m/s. The objects undergo a perfectly inelastic collision (stick together). The velocity of the 4.00 kg object after the collision is

A 1200 kg car travels at 25.0 m/s and collides head-on in a perfectly inelastic collision with a stationary 2400 kg truck. The kinetic energy lost in the collision is

A 120 kg mass, initially at rest, is blown apart into a 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The speed of the 80 kg mass is