a disc of mass 20kg and radius 0.15m is mounted on a horizontal cylindrical axle of radius 0.015m and negligible mass. No frictional losses exist in the ring, calculate the moment of inertia of the disc?​

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.

How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?