Question

If earth suddenly stop rotating, then the weight of an object of mass $m$ at equator will $[\omega$ is angular speed of earth and $R$ is its radius].

• A. Decrease by $m{\omega }^{2}R$
• B. Increase by $m{\omega }^{2}R$
• C. Decrease by $m\omega R^2$
• D. Increase by $m\omega R^2$

Answer 1

Answer: (B)

At the equator,
Apparent weight, $w^{\prime }=w-m{\omega }^{2}R$
if Earth stops rotating, $w^{\prime }$ will be equal to $\omega$.
Thus, the weight of an object of mass $m$ at equator will increase by $m{\omega }^{2}R$,