Physics · 2017
JEE Main · 8 April 2017, Shift 1 · Q7
If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate…
If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate about its axis so that the person at the equator will weigh $\displaystyle \frac{3}{4} \mathrm{~W}$. Radius of the Earth is $\displaystyle 6400$ km and $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$.
Official answer
(3)
$\displaystyle 0.63 \times 10^{-3} \mathrm{rad} / \mathrm{s}$
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JEE Main 2017 Physics question, with the answer from NTA’s final answer key. Where our answers come from.