Exam 6: Linear Momentum and Collisions

Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100. m from the mothership. She throws her 2.00 kg wrench at 20.0 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?

In an inelastic collision, the initial kinetic energy is less than the final kinetic energy.

Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They push each other apart. What is their separation after the heavier astronaut has moved 12. m?

A handball of mass 0.10 kg, traveling horizontally at 25. m/s, strikes a wall and rebounds at 19. m/s. What is the change in the momentum of the ball?

Daisy (50. kg mass) skates on ice at 4.0 m/s to greet her friend (70. kg mass), who is standing still, with open arms. As they collide, while holding each other, with what speed do they both move off together?

A 2.0 kg mass moving to the East at a speed of 4.0 m/s collides head-on in an inelastic collision with a stationary 2.0 kg mass. How much kinetic energy is lost during this collision?

A 2200. kg auto moving at 12.0 m/s runs into a 3800. kg truck which is moving in the same direction at 5.00 m/s. The collision is perfectly inelastic. (a) What is the speed of the auto immediately after the collision? (b) What percentage kinetic energy did the truck gain in the collision?

The center of mass and the center of gravity coincide

In an inelastic collision, the final total momentum is

Water runs out of a horizontal drainpipe at the rate of 120. liters per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?

If you pitch a baseball with twice the kinetic energy you gave it in a previous pitch, the magnitude of its momentum is

Three masses are positioned at the following coordinates: 3.0 kg at (3,2) What are the coordinates of the center of mass of the system?

A machine gun, of mass 35. kg, fires 50. gram bullets, with a muzzle velocity of 750. m/s, at the rate of 300. rounds per minute. What is the average force exerted on the machine gun mount?

A 60. gram toy rocket achieves a speed of 80. m/s after 3.0 s, when fired straight up. What is the average total force on the rocket during the 3 s?

A 60. kg person walks along a 100. kg log at the rate of 0.8 m/s (with respect to the log). With what speed does the log move, with respect to the shore?

Discuss similarities and differences between KINETIC ENERGY and MOMENTUM.

Consider two unequal masses, M and m. Which of the following statements is false?

Automobile air bags reduce what during a collision?

When a light beach ball rolling with a speed of 6 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be approximately

A 3. kg ball of putty moving at 1 m/s collides and sticks to a 2 kg ball initially at rest. The putty and ball then move with a momentum of