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If the Earth suddenly shrinks so as redu...

If the Earth suddenly shrinks so as reduce its volume, mass remaining unchanged, what will be the effect on the duration of the day ?

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If the Earth suddenly shrinks, mass remaining constant, the moment of inertia of the Earth will descrease, and consequently the angular speed of rotation `omega` about its axis will increase. Since period `Tprop1/omega`. The duration of the day T will decrease.
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