How many watts in a kilowatt

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9