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What is the empirical formula for the tractive force required to overcome curve resistance? (W-the weight of the body, R – radius of curvature)

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What is the empirical formula for the tractive force required to overcome curve resistance? (W-the weight of the body, R – radius of curvature)

(a) 710×W÷R

(b) 700×W÷R

(c) 720×W÷R

(d) 750×W÷R

The question was asked in an online quiz.

Question is taken from Dynamics in chapter Dynamics of Electrical Drives of Electric Drives

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Correct answer is (b) 700×W÷R

The explanation: Fc= 700×W÷R is the tractive force required to overcome curve resistance where W is the weight of the body in Kg and R be the radius of curvature in meters.

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