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Find the crank radius when the length of the stroke is 80mm?

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Find the crank radius when the length of the stroke is 80mm?

(a) 10mm

(b) 40mm

(c) 30mm

(d) 50mm
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The correct answer is (b) 40mm

The best explanation: Crank radius r=(frac{l}{2})

                                                =(frac{80}{2})

                                                =40mm
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