A wheel and axle is used to raise a load of 500 N by the application of an effort of 250 N. If the radii of the wheel and the axle are 0.4 cm and 0.1 cm respectively, the efficiency of the machine is

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A wheel and axle is used to raise a load of 500 N by the application of an effort of ...

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Correct Answer: C

Explanation

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