Question

If the rotational speed of earth is increased then weight of a body at the equator:

• A. increases
• B. decreases
• C. becomes double
• D. does not change

Answer 1

Answer: (B)

The acceleration due to gravity at the equator is given by
$g=g-R_e{\omega }^2$
According to the question, the rotational speed or angular velocity is increased and so, the amount of $R_e{\omega }^2$ will increase. Therefore, the acceleration due to gravity $(g)$ on equator will decrease which will cause the weight of body to decrease.