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Physics - Rotation Question with Solution | TestHub

PhysicsRotationAngular momentumHard2 minPYQ_2011

PhysicsHardsingle choice

If the Earth were to suddenly contract to $\frac{1}{n}$ th of its present radius without any change in its mass, the duration of the new day will be nearly

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Solution:

Hints: $I_{1} ω_{1} = I_{2} ω_{2}$ $\frac{2}{5} MR^{2} (\frac{2 π}{T _{1}}) = \frac{2}{5} M \cdot \frac{R ^{2}}{n ^{2}} (\frac{2 π}{T _{2}}) T_{2} = \frac{T _{1}}{n ^{2}} = \frac{24}{n ^{2}}$

Stream:WBJEESubject:PhysicsTopic:RotationSubtopic:Angular momentum

⏱ 2mℹ️ Source: PYQ_2011

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