Which statement is true about an object moving in a circular motion due to centripetal force, f, when the mass is doubled

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

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

The necleus of an atom is made up of what subatomic particles?