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Physics - Rotation Question with Solution | TestHub

PhysicsRotationAngular momentumEasy2 minPYQ_2020

PhysicsEasysingle choice

If the earth shrinks such that its mass does not change but radius decreases to one-quarter of its original value then one complete day will take

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Answer:

Solution:

We know that angular momentum of the spin $= I ω$

By the conservation of angular momentum

$\frac{2}{5} M R^{2} . \frac{2 π}{T} = \frac{2}{5} M {(\frac{R}{4})}^{2} . \frac{2 π}{T^{'}}$

$T^{'} = \frac{T}{16} = \frac{24}{16} = 1.5 h$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:RotationSubtopic:Angular momentum

⏱ 2mℹ️ Source: PYQ_2020

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