What is the efficiency of a heat engine, which performs a mechanical work of 138MJ, consuming 6 kg of gasoline? Help much appreciated :)

In physics the desire of an object to keep doing what it is doing is termed?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.

3. which is not a primary color of light? blue red green yellow