A machine performs 90 J of work in lifting an object. It requires 120 J of work do lift it. How much heat is created by the machine?

Every object with mass exerts a gravitational force on every other object with mass. The gravitational force between which of the following two objects would be easiest to detect with measuring equipment? A. an electron and a bowling ball OB.

Suppose that you hear a clap of thunder 16.2 s (seconds) after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s and the speed of light in air is 3.00*10^8 m/s. How far are you from the lightning stroke?

Distinguish between endangered and extinct species.

A 25.0-kg box of textbooks rests on a loading ramp that makes an angle α with the horizontal. The coefficient of kinetic friction is 0.25, and the coefficient of static friction is 0.35.

If you were made of rubber then you would just stretch in response. But humans are composed of other materials such as bones and muscles and organs. Your body would stay whole until the instant the tidal force exceeded your body's molecular bonds.

The difference in electric potential between a thunder cloud and the ground is 1.53 108 V. Electrons move from the ground which is at a lower potential to the cloud which is at a higher potential.

A vitamin called folic acid is very important for neural tube development, which is the development of the baby's

Which vocabulary term is survival of the fittest

An object weighs 32 newtons. What is its mass if a gravitometer indicates that g = 8.25 m/s2?

At what stage of a reaction do atoms have the highest energy? a. reactant stage b. product stage c. transition state stage d. The stage of highest energy depends on the atom.