Question

Earth is flattened at poles and bulging at equator. This is due to

• A. revolution of Earth around the Sun in an elliptical orbit
• B. angular velocity of spinning about its axis is more at Equator
• C. centrifugal force is more at Equator than poles
• D. more centrifugal force at poles than Equator

Answer 1

Answer: (C)

centrifugal force is more at Equator than poles

Earth revolves about an axis that passes through poles.
Centrifugal force is given by $mr{\omega }^2$.
$\omega$ is constant, but at equator $r$ is more, so is the centrifugal force.
So, the Earth looks bulged at the equator.