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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:A. its moment of inertia increasesB. its angular velocity increases.C. its angular velocity decreasesD. its diameter increases. |
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Answer» Correct Answer - A::B::C As the disc is heated the diamter of the hole as weill as the disc increases due to thermal expansion. Consequently the moment of inertial increases. From conservation of angular momentum `I_(1)omega_(1)=I_(2)omega_(2)` angular velocity decreases due to increase in moment of inertia. |
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