Question

If the earth were to suddenly contract to 1/nth of its present radius without any change in its mass, the duration of the new day will be nearly

Moderate

Solution

$I_{1} ω_{1} = I_{2} ω_{2}; \frac{I_{1}}{T_{1}} = \frac{I_{2}}{T_{2}}, R_{2} = \frac{R_{1}}{n}$ and I is proportional to r²

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