he turntable in a microwave oven has a moment of inertia of 0.040 kg⋅m2 and is rotating once every 4.4 s . What is its kinetic energy?

The figure shows a rigid assembly of a thin hoop (of mass m = 0.24 kg and radius R = 0.16 m) and a thin radial rod (of length L = 2R and also of mass m = 0.24 kg). The assembly is upright, but we nudge it so that it rotates around a horizontal axis in the plane of the rod and hoop, through the lower end of the rod. Assuming that the energy given to the assembly the nudge is negligible, what is the assembly's angular speed about the rotation axis when it passes through the upside-down (inverted) orientation? Number i Rod Hoop ! Rotation axis Units

A 85.0 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.110 m/s. How much work must be done on the hoop to stop it? Number i 1.03 Units

e One way to store energy is in the rotational motion of a flywheel, and some have proposed using suchtechnology to power automobiles. One unit is based on a 6.0-kgflywheel in the shape of a hoop of radius 0.10 m that spins as fastas 60,000 rpm. (a) How much kinetic energy is stored by the flywheel when it is rotating at its maximum rate? (b) If the vehiclerequires an average power of 11 kW under normal driving conditions, for how much time can it operate with the energy stored inthe flywheel?