Which of the device used for the process of measuring the heat reaction

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?

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?