How do the nuclei of different isotopes of an element vary?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points