A grinding machine whose wheel has a radius of 1/π is rotating at 2.5 rev/sec. A tool to be shar-pened is held against the wheel with a force of 40N. If the coefficient of friction between the tool and wheel is 0.2, power required is

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40W

10W

answer is A.

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Detailed Solution

P=τω=μrFω=1π×0.2×40×2π×2.5=40W

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