A change in the average kinetic energy of the molecules of an object may best be detected by measuring a change in the objects

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2