5. A wheel initially rotates with an angular velocity of 2.34 rad/s and had a constant acceleration of -3.21 rad/s. a) How many seconds will it take the wheel to come to rest? b) How many revolutions will the wheel make before coming to rest? 6. Consider a rotating disk of radius R and mass M that can rotate about a central axis in a horizontal plane. It is initially at rest at t=0. It is given a constant angular acceleration of magnitude Z rad/s. Consider a penny of mass m that is placed on the disk at a distance R/2 from the central axis. The coefficient of static friction between the penny and the rotating disk is g. At what time will the penny fly off the disk?