A person uses a simple machine to help him perform a difficult task. He performs 25 J of work on the machine, which performs 22 J of work in return. What is the machine’s efficiency?

Study the following reaction carefully. what classification should this reaction have? 4al + 3o2 2al2o3synthesisdecompositionsingle replacementdouble displacement

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s