010 10.0 points What has the greatest amount of potential
energy?
1. a 0.5 kg book at the top of a 100 m hill
a
2. a 2 kg boulder at the top of a 10 m hill
3. a 5 kg rock raised 5 m off the floor
4. a 2 g penny in an airplane at 1000 m
above the earth

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?