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Which of the following is not a unit for power? -(Joule)x(Second) -Watt -(Newton)x(meter)/(second) -Horsepower

(Joule)x(Second)

How many Joules of energy are in one kilowatt-hour?

3.6 megajoules

A feather and a coin dropped in a VACUUM fall with equal _____.

accelerations

Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is _____.

always true

Two identical arrows, one with twice the SPEED of the other, are fired into a hay bale. The faster arrow will penetrate _____.

four times as far as the slower arrow

An object that has potential energy has this energy because of its _____.

location

An object that has kinetic energy must be _____.

moving

An object is moved upwards 2 meters and gains a certain amount of potential energy. Then it is moved 4 meters sideways and gains _____.

no potential energy

A feather and a coin are dropped in the AIR. Each falls with equal _____. -acceleration -kinetic energies -potential energies -none of the above

none of the above

If an object has kinetic energy, then it also must have _____.

speed

Two identical arrows, one with twice the KINETIC ENERGY of the other, are fired into a hay bale. The higher energy arrow will penetrate _____.

twice as far as the slower arrow

When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______.

twice as much

Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is _____.

twice that of car B

When a bullet is fired from a rifle, the force on the rifle is equal to the force on the bullet. However, the energy of the bullet is greater than the energy of the recoiling rifle because the _______.

force on the bullet acts for a longer distance

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

less than 100J


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