A1090 kg car has four 12.7 kg wheels. when the car is moving, what fraction of the total kinetic energy of the car is due to rotation of the wheels about their axles? assume that the wheels have the same rotational inertia as uniform disks of the same mass and size.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.