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  4. A metallic circular disc having a circular hole at its centre rotates about an axis passing through its centre and perpendicular to its plane. When the disc is heated :

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Q. A metallic circular disc having a circular hole at its centre rotates about an axis passing through its centre and perpendicular to its plane. When the disc is heated :

Thermal Properties of Matter

Solution:

Due to rise in temperature its radius increases and which causes its moment of inertia to increase and to conserve angular momentum its angular speed decreases as no external torque is acting on it.