The radius of earth is 6400km and g = 9.8 m/sec2. If the body placed at the equator has to become weightless the earth should make one complete rotation in :

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12 hour

1.4 hour

6 hour

24 hour

answer is B.

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Detailed Solution

mg'=mg−mω2R=0⇒ ω=gRT=2πω=2πRg=1.4 hour

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