Question

If the speed of rotation of the Earth increases, the weight of the body at the equator will :

• A. Increase
• B. Remain the same as before
• C. Be zero
• D. Decrease

Answer 1

The correct option is D Decrease

$Answer:-$ D

Value of g at any point on earth is given by:

$g^{\prime }=g-{\omega }^{2}R\cos \phi$

At equator $\phi =0$

So, $g^{\prime }=g-{\omega }^{2}R$

As $\omega$ increases gravity decreases and hence weight (mg) also decreases.