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The earth has a mass of 6 xx 10^(24) kg ...

The earth has a mass of `6 xx 10^(24) kg` and a radius of `6.4 xx 10^(6)m`. Calculate the amount of work that must be done to slow down its rotation so that duration of day becomes `30` hrs instead of 24 hours.
Moment of inertia of earth `= (2)/(5)MR^(2)`.

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The correct Answer is:
`9.36xx10^(28) J`
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