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Physics - Rotation Question with Solution | TestHub

PhysicsRotationAngular momentumMedium2 minPYQ_2025

PhysicsMediumsingle choice

The Sun rotates around its centre once in 27 days. What will be the period of revolution if the Sun were to expand to twice its present radius without any external influence? Assume the Sun to be a sphere of uniform density.NEET 2025

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Answer:

Solution:

Angular Momentum conservation $I_{1} ω_{1} = I_{2} ω_{2} ω_{2} = \frac{ω _{1}}{4} T = \frac{2 π}{ω} M = same R_{2} = 2 r_{1} I \propto r^{2} I_{2} = 4 I_{1} T_{1} = 27 day$ $T_{2} = 4 T_{1} = 4 \times 27 T_{2} = 108 days$

Stream:NEETSubject:PhysicsTopic:RotationSubtopic:Angular momentum

⏱ 2mℹ️ Source: PYQ_2025

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