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JEE Main2018PhysicsGravitationActual

Suppose that the angular velocity of rotation of the Earth is increased. Then, as a consequence,

Options

  1. Aweight of the object, everywhere on the earth, will decrease.
  2. Bweight of the object, everywhere on the earth, will increase.
  3. Cexcept at poles, weight of the object on the earth, will decrease.
  4. Dthere will be no change in weight anywhere on the earth.

Correct answer

C. except at poles, weight of the object on the earth, will decrease.

Step-by-step solution

Effective acceleration due to gravity, g ′ = g - ω 2 R cos 2 ⁡ ϕ , where ϕ is latitude. There will be no change in gravity at poles as ϕ = 90 o . At other points as ω increases, g ' will decrease.

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