PHYSICS 4.07 First Law of Thermodynamics

Which of the following statements correctly describes a heat engine?

Work is done by transferring thermal energy from a hot reservoir to a cold one.

The first law of thermodynamics is related to the conservation of which quantity?

energy

Which of the following devices does not convert heat energy to mechanical energy?

windmill

If the efficiency of a heat engine that does 1.00 × 103 J of work is 70 percent, then what is the heat input?

1.43 × 103 J

How much work can be extracted from 5.00 × 104 J of heat when 2.00 × 104 J of heat is exhausted?

3.00 × 104 J

If you do 1,000 J of work on a system and remove 500 J of heat from it, what is the change in its internal energy?

500 J

Which of the following statements would best describe how to increase the work done by a heat engine?

Lower the temperature of the exhaust.