A hollow ball of diameter D is suspended from a string of negligible mass whose length...

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A hollow ball of diameter D is suspended from a string of negligible mass whose length...

A hollow ball of diameter D is suspended from a string of negligible mass whose length is equal to the ball’s diameter. The string is attached to the surface of the ball.

Find an expression for the period of this physical pendulum in the small-amplitude approximation.

Express your answer in terms of D and gravitational acceleration g.

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