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A grindstone used to sharpen tools is rotating at an angular speed of 8.00 rad/s when an axe is pressed against it. Because of the torque produced on the grindstone by the force of friction between it and the axe, it comes to rest in four rotations. There is negligible friction in the grindstone's bearings.
a. Find the frictional force produced, assuming the grindstone is a cylinder of mass 5.00 kg and radius 0.425 m.
b. If the coefficient of friction between the axe and grindstone is 0.320, find the normal force with which the axe was pressed against the grindstone.
Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.
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While the temperature of a gas whose activation energy is 55 kJ/mol is increased from 300 K to 320 K, the fraction of collisions with sufficient energy to react decreases by a factor of 4.
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