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What is the formula of the centrifugal force?

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What is the formula of the centrifugal force?

(a) centrifugal force = weight of revolving body * 39.43 * speed^2 * radius of circular path

(b) centrifugal force = weight of revolving body / 39.43 * speed^2 * radius of circular path

(c) centrifugal force = weight of revolving body * 39.43 / speed^2 * radius of circular path

(d) centrifugal force = weight of revolving body * 39.43 * speed^2 / radius of circular path

This question was addressed to me during an internship interview.

I'd like to ask this question from Frames of D.C. & A.C. Machines topic in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines

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The correct option is (a) centrifugal force = weight of revolving body * 39.43 * speed^2 * radius of circular path

The explanation: The weight of revolving body, speed, radius of circular path is calculated. On substitution the centrifugal force is obtained.

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