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What is the effect of rotation of earth on the acceleration due to gravity?

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What is the effect of rotation of earth on the acceleration due to gravity?

(a) The acceleration due to gravity decreases

(b) The acceleration due to gravity increases

(c) There is no effect

(d) The acceleration due to gravity first increases and then decreases

The question was posed to me during an online exam.

Asked question is from Gravitational Potential Field topic in division Mechanical Properties of Solids of Engineering Physics I

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Correct choice is (a) The acceleration due to gravity decreases

For explanation: The acceleration due to gravity decreases due to the rotation of the earth. This effect is zero at the poles and maximum at the equators.

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