Question

If the earth was to rotate faster than its present speed, the weight of an object will

• A. Increase at the equator but remain unchanged at the poles
• B. Decrease at the equator but remain unchanged at the poles
• C. Remain unchanged at the equator but decrease at the poles
• D. Remain unchanged at the equator but increase at the poles

Answer 1

The correct option is B Decrease at the equator but remain unchanged at the poles

At the equator, $g^{\prime }=g-R{\omega }^2$
As $\omega$ increases, $g^{\prime }$ decreases and hence weight decreases.
At the pole, $g^{\prime }=g$.
So weight remain unchanged