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Q.

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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a

12 hour

b

1.4 hour

c

6 hour

d

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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