Physics Chapter 5 questions

The power required to exert 1 N force, over a distance of 1 m in 1 second as

1 W

On a sunny day about 500 watts of solar power are received by each of the four solar cells on the roof of a solar-powered automobile. If the solar cells were 100% efficient, they would deliver

2.7 hp

A 1000-kg car moving at 10 m/s brakes to a stop in 5s. The average braking force is

2000 N

Suppose a miracle car has a 100% efficient engine and burns fuel that has a 40-megajoules-per-liter energy content. If the air drag and overall frictional forces on this car traveling at highway speeds total 1000 N, what is the overall limit in distance per liter it could be driven on the highway?

40 km

The conservation of momentum is most closely related to

Newton's third law

Two pool balls, each moving at 2 m/s, roll toward each other and collide. Suppose after bouncing apart, each moves at 4 m/s. This collision violates conservation of

energy

Momentum is transferred to the ground when an apple falls on it. The momentum absorbed by the ground is

greater than that of the apple only if the apple bounces

A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of the trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is

less than 100 J

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

move away from each other, but at different speeds

A woman carries a heavy box across a room at a constant speed. How much work does she do on the box while walking?

none

A light aluminum ball and a heavy lead ball of the same size are allowed to roll down and incline. When they are halfway down the incline, they will have identical

not inertias, potential energies, momentum, or kinetic energies

A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will have a greater

not momentum, speed, or acceleration

A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of

power

If you push an object a given distance, while applying twice the force, you do

twice as much work