Question: A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 30 cm diameter stone is spinning at 200 rpm and

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 30 cm diameter stone is spinning at 200 rpm and has a mass of 23 kg. The coefficient of kinetic friction between the knife and the stone is 0.20.

If the stone loses 10% of its speed in 10 s of grinding, what is the force with which the man presses the knife against the stone?

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