Question

If the earth stops rotating, the apparent value of g on its surface will
(a) increases everywhere
(b) decreases everywhere
(c) remains the same everywhere
(d) increases at some places and remain the same at some places.

Answer 1

Answer ⇒ Option (d).  Increases at some places and remain the same at some places.

Explanation/Reason ⇒ If the earth stops rotating the apparent weight will increase at most of the places because the upward component of the centrifugal force due to rotation will disappear.

The equation of the variation in g is given by,

g = g' - 2ωr, if the earth stops rotating then the omega will be zero as a result, g = g'.

This means apparent value of g is increased. Hence, the weight of the object also increases.

But at poles it will not change because these places do not rotate in a circle on the earth's surface.    

Hope it helps.

Answer 2

Option (d).  Increases at some places and remain the same at some places.