If you press as hard as you can against a brick wall until you begin to sweating and breathing hard did you do any work on the wall? explain.

Excuse ! extra points plus ! super desperate ! the position of an object does not move relative to a reference point. relative to the reference point the object _. a.) is not moving. b.) is moving.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Which of these activities increases the amount of carbon in the atmosphere?