Asked by Hasibul
A small mass m swings in a horizontal circle of radius r at the end of a string of length Li and
negligible mass, which makes an angle i with the vertical. The string is slowly shortened (for
example by pulling it through a hole in its support) until the final length is Lf and the string is
making an angle f with the vertical. Find an expression for Lf in terms of Li; i and f
negligible mass, which makes an angle i with the vertical. The string is slowly shortened (for
example by pulling it through a hole in its support) until the final length is Lf and the string is
making an angle f with the vertical. Find an expression for Lf in terms of Li; i and f
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