# How to calculate power

Power is defined as the

If you exert 6 N across a distance of 2 m in 3 s you’ll deliver a power of

It takes 40 J to push a large crate 4 m across a floor. The force exerted on the crate is

A melon is projected into the air with 100 J of kinetic energy in the absence of *air resistance*. When it returns to its initial level its kinetic energy is

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

Which has greater kinetic energy, a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?

If you do work on an object in half the time, your power output is

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

An object that weighs 20 N has 40 J of potential energy relative to the ground. What is its height?

A shopping cart moves with a kinetic energy of 40 J. If it moves at twice the speed, its kinetic energy is

A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is

Which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4 m?

Temperature of an object is the measure of ___________ of its particles.

The fact that a thermometer “takes its own temperature” illustrates