Q. What will be the effect on the weight of a body placed on the surface of earth, if earth suddenly starts rotating with half of its angular velocity of rotation?
A) No effect
B) Weight will increase
C) Weight will decrease
D) Weight will become zero
Explanation
(b) The value of $g$ at latitude $\lambda$ is ; $g^{'} = g - R\omega^{'2}\cos^{2}\lambda.$ If earth stops rotating, $\omega = 0;g^{'} = g$. It means the weight of body will increase
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.