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Question

In order to make the effective acceleration due to gravity equal to zero at the equator, the angular velocity of rotation of the earth about its axis should be (g=10 ms2 and radius of earth is 6400 km)

A
0 rad sec1
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B
1800 rad sec1
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C
180 rad sec1
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D
18 rad sec1
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Solution

The correct option is B 1800 rad sec1
g=gω2Rcos2λat equator λ=0For weightlessness g=00=gω2Rω=gR=1800rads

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