To calculate the mechanical advantage of a lever what two pieces of information do you need?
a. effort force and fulcrum weight
b. resistance force and length of effort arm
c. effort force and the length of effort arm
d. the length of the effort arm and the length of the resistance arm

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

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.

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical