A mass m = 6.0 kg is attached to the lower end of a massless string of length L = 73.0 cm. The upper end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the string makes an angle theta = 27o with the vertical, as shown in the figure. How long does it take the mass to make one complete revolution?
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see this as an example. https://answers.yahoo.com/question/index?qid=20100218185124AA0oXZ0
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