Question

The speed with which the earth have to rotate on its axis so that a person on the equator would weigh \((3/5)^{\text{th}\) as much as present. (Radius of earth = 6400 km)}

• A. \(4.83 \times 10^{-3}\) rad s\(^{-1}\)
• B. \(5.41 \times 10^{-3}\) rad s\(^{-1}\)
• C. \(7.82 \times 10^{-4}\) rad s\(^{-1}\)
• D. \(8.88 \times 10^{-14}\) rad s\(^{-1}\)

Hint:

At equator, centripetal acceleration reduces effective weight. At poles, weight = mg.

Answer 1

The Correct Option is C