What kind of energy drives all the processes important to life on earth?

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?

Energy flows from the producer level to the level. is called

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?