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If the earth suddenly contracts by one-f...

If the earth suddenly contracts by one-fourth of its present radius, by how much would the day be shortened?

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SL ARORA-System of particles & rotational Motion-EXERCISE
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  3. If the earth suddenly contracts by one-fourth of its present radius, b...

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  4. Prove that for an earth satellite, the ratio of its velocity at apogee...

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