One complete revolution of earth around the sun takes about
a.
one rotation.
b.
one season.
c.
one year.
d.
one eclipse.

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

What is the most useful equation for electric power?

Place me with this question is my last question