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What power is developed by a grinding ma...

What power is developed by a grinding machine whose wheel has a radius of 20 cm and runs at 2.5 revolutions per second when the tool to be sharpened is held against the wheel with a force of 20 kg ? The coefficient of friction between the tool and the wheel is 0.3
[Hint : Power `= Fv = F omega r = mu N omega r` where N is the normal reaction]

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