A rock is at the top of a 30 meter tall hill. The rock has a mass of 15kg. How much potential energy does it have?

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?