An elevator provides 21 000 w of power during a 12 s ride. how much work does the elevator do?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.