An airplane propeller is 2.02 min length (from tip to tip) with mass 109 kg. The propeller is rotating at 2000 rev/min about an axis through its center.
(a) What is its rotational kinetic energy? Treat thepropeller as a slender rod.
__________ J
(b) If it were not rotating, how far would it have to drop in freefall to acquire the same kinetic energy?
__________ km