The minute hand of the clock on the wall is about 12.0cm long. The tip of the minute hand has a mass . The change in gravitational potential energy of the tip of the minute hand as the time changes from 10:00a.m. to 10:30a.m. is:
a. 0.24 mg
b. -0.24 mg (Correct Answer)
c. 9.12 mg
d. 0.12 m
My question is, how was the answer acquired? I was thinking along the lines of using the equation , thought I'm confused about what the h value should be. Does the 12cm (0.12m) even have anything to do with any value? Or will I have to somehow calculate some angle of the clock to find the displacement using the equation ? I think the fact that the tips displacement from 10:00 to 10:30 being of the clock's circumference having something to do with it, but I'm not sure.