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Show that the effect of the radius of revolution being a little different from the length of the string exactly cancels the effect of the

Show that the effect of the radius of revolution being a little different from the length of the string exactly cancels the effect of the tension (equivalently the washer weight) being a little different from the centripetal force so that the period can be expressed in terms of just the masses and length of string (without referencing the angle).

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