If the actual frictional force is equal to 1 lb., then how much effort (force) would be required to drag a 90 lb. box up the plane?

10+ lb.

10- lb.

9+ lb.

9- lb.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

What is the temperature in degrees celsius of a substance with a tempature of 49k

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.