Exam 7: Linear Momentum

A ball of mass 3m, moving at speed v to the right, approaches a ball of mass 2m, moving at speed 2v to the left. After the balls collide, what is the velocity of the center of mass?

A rifle fires a bullet. Immediately after the bullet is fired, which of the following is not true?

A 4.00 kg object is moving at 5.00 m/s NORTHWEST. It strikes a 6.00 kg object that is moving SOUTHWEST at 2.00 m/s. The collision is perfectly inelastic. The kinetic energy lost in the collision is

A 4.0 kg object is moving at 5.0 m/s NORTH. It strikes a 6.0 kg object at rest. The objects collide elastically and move away in the NORTH or SOUTH direction. The velocity of the 4.0 kg object after the collision is

A 4.00 kg object is moving at 5.00 m/s WEST. It catches up to and strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects undergo an elastic collision and move away in the EAST-WEST direction. The velocity of the 6.00 kg object after the collision is

A 4.00 kg ball is moving at 4.0 m/s to the right and a 6.00 kg ball is moving at 3.00 m/s to the left. The total momentum of the system is

A 3.0 kg object is moving to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A 30.0 g mass is located at the origin. Where must a mass of 10.0 g be located if the coordinates of the center of mass are (0.00 cm, 10.0 cm)?

A ball collides with a second ball at rest. As a result of the collision, the first ball comes to rest and the second ball moves off at the speed of the first ball. In this collision

A 4.0 kg object is moving at 5.0 m/s NORTH. It strikes a 6.0 kg object at rest. The objects collide elastically and move away in the NORTH or SOUTH direction. The velocity of the 6.0 kg object after the collision is

A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars undergo an elastic collision and move in the EAST or WEST direction. The magnitude of the relative velocity between the cars after the collision is

A 1700 kg car travels at 20 m/s WEST and collides with a 2000 kg car traveling EAST. The collision is completely inelastic and they both come to rest. What was the velocity of the 2000 kg car?

A 3.000 kg ball is pitched with a kinetic energy of 20.00 J. The magnitude of the momentum of the ball is

A pair of identical balls are connected by a massless rod and thrown straight up into the air, such that the center of mass of the pair reaches a maximum height of 13.2 m above the point of release. On the way up, when the center of mass is at 6.6 m above to point of release, the velocity of one ball is measured to be 7.7 m/s straight downward. What is the velocity of the other ball at this time? Ignore air resistance.

A 4.00 kg ball is moving at 2.00 m/s to the SOUTH and a 6.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is

A 1,800 kg car is traveling at 20.0 m/s NORTHEAST. The momentum of the car is

A 4.0 kg ball is traveling at 5.0 m/s to the right and strikes a wall. The ball bounces off the wall with a velocity of 4.0 m/s to the left. The change in momentum of the ball is

In any collision

At a carnival game, two balls are identical in mass and radius, but one is made of steel, and one is made of rubber. The game is to throw them at a bowling pin and try to knock it over. If the balls are thrown with the same speed and hit the same spot on the bowling pin, which is more likely to knock it over?

Two objects undergo a collision, and there is no external force on the objects. Which of the following must be true?