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12 Nov 2019
A tradesman sharpens a knife by pushing it against the rim of agrindstone. The 50 cm diameter stone is spinning at 200 rpm and hasa mass of 18 kg. The coefficient of kinetic friction between theknife and the stone is 0.20.
If the stone loses 10 percent of its speed in 10 s of grinding,what is the force with which the man presses the knife against thestone?
A tradesman sharpens a knife by pushing it against the rim of agrindstone. The 50 cm diameter stone is spinning at 200 rpm and hasa mass of 18 kg. The coefficient of kinetic friction between theknife and the stone is 0.20.
If the stone loses 10 percent of its speed in 10 s of grinding,what is the force with which the man presses the knife against thestone?
Nelly StrackeLv2
13 Mar 2019
