A hollow sphere of radius \( 2 \mathrm{~cm} \) is attached to an \( 18 \mathrm{~cm} \) long thre...

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A hollow sphere of radius \( 2 \mathrm{~cm} \) is attached to an \( 18 \mathrm{~cm} \) long thread to make a pendulum. Find the time period of oscillation of this pendulum. How does it differ from the time period calculated using the formula for a simple pendulum ?
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