Question

3. A certain engine is filled with gasoline that contains chemical energy, and when the engine is started, it begins transforming that chemical energy into mechanical energy. Over the course of a few seconds, the engine transforms 7,000J of chemical energy, but 5,000J of that energy is ‘wasted’ in the form of thermal energy.
Calculate the efficiency of the engine over these few seconds.

Answer 1

Answer:

It should have efficiency of 2500...