What is the value of the universal gravitation constant (g)? is this a large or small
number? how do you know?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

State the right hand rule of the direction of magnetic field in a conductor carrying current

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.