A 20 g. book is sitting on a shelf that is 3.0 meters off the ground. Kinetic energy is found using the formula 1/2 x mass x speed. Potential energy is found by taking mass x g x height, with g as the
constant, 9.8 m/s? What is needed to determine the book's mechanical energy as it sits on the shelf?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?