Exam 3: Momentum and Energy

According to the impulse-momentum relationship Ft = change in mv,a falling bungee jumper has momentum which is reduced by the force F exerted by the bungee cord.If v is the speed of the jumper,then m in the equation is the mass of the

The exhaust product from a hydrogen fuel cell is

A heavy truck and a small truck roll down a hill.Neglecting friction,at the bottom of the hill the heavy truck has greater

Just after a big fish swallows a small fish,the momentum of the two-fish system is

An object may have potential energy because of its

An astronaut floating alone in outer space throws a baseball.If the ball moves away at 20 m/s,the astronaut will move in the opposite direction at

When you simultaneously drop a light tennis ball and a heavy bowling ball,they hit the floor

A popular swinging-balls apparatus (Newton's cradle)consists of a series of identical elastic balls suspended by strings so they barely touch each other.When two balls are pulled away from one end and released,they strike the row of balls and two balls pop out from the other end.If instead,one ball popped out with twice the speed,this would violate the conservation of

What is the mass of a ball moving at 4 m/s with a momentum of 48 kg∙m/s?

A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest.The speed of the larger fish after lunch is

A car traveling along the highway brakes to a stop.A greater braking force is required when the car has

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground.The amount of energy converted to heat is about

Whether a truck comes to a stop by crashing into a haystack or a brick wall,the impulse is

A 1-N-falling apple hits the ground with a force of

Consider a gun with a pellet that is more massive than the gun.The firing speed is greater for the

Work is done by gravity on a bowling ball that rolls

Compared with falling on a wooden floor,a wine glass may not break when it falls on a carpeted floor because of

A cat and a mouse run along a road with the same kinetic energy.The faster runner is the

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball initially at rest.After the putty sticks to the ball,both move with a combined momentum of

If you exert 100 J to lift a box in 50 s your power output is