A bob of mass is suspended from a fixed point with a massless string of length L

Question

A bob of mass is suspended from a fixed point with a massless string of length L (i.e., it is a pendulum). You are to investigate the motion in which the string moves in a cone with half-angle ? . Part A What tangential speed,v , must the bob have so that it moves in a horizontal circle with the string always making an angle from the vertical? (Express your answer in terms of some or all of the variables m, L, and ?, as well as the acceleration due to gravity g.) Part B How long does it take the bob to make one full revolution (one complete trip around the circle)? (Express your answer in terms of some or all of the variables m, L, and ?, as well as the acceleration due to gravity g.)

Explanation / Answer

I've posted a scan of what I think is a pretty complete and correct solution to this problem, along with a few explanations of what I did: http://asbisme.tripod.com/pendulum.html

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