No matter what you do, matter can neither be created nor destroyed. This property of the universe is called the law of ...

A man lifts his suitcase. The increase in gravitational potential energy of the suitcase is 264 J. The mass of the suitcase is 12 kg. Recall the equation for gravitational potential energy.

This would break the law of conservation of energy. A crane is designed to lift an object up. The energy transfer equation for lifting a piece of metal is given below. Calculate the efficiency of ...