A person with an axe to grind is using a whetstone. The whetstone is connected to a motor which keeps it rotating at 85 rev/min. The whetstone is a solid cylinder of made of a special type of stone of mass 45 kg and radius 20 cm. The heavy axeblade is being pressed onto the whetstone with a steady force of 25 N directed into the centre of the whetstone. Suddenly, the power to the motor is cut but the person maintains the force of the axe on the whetstone. The coefficient of kinetic friction between the axe and the stone is 0.60. The moment of inertia of a cylinder about it's centre of mass is I = ½MR2. (a) Calculate the torque of the frictional force on the wheel. (b) Calculate the total angle through which the wheel turns from the
A person with an axe to grind is using a whetstone. The whetstone is connected to a motor which keeps it
rotating at 85 rev/min. The whetstone is a solid cylinder of made of a special type of stone of mass 45 kg
and radius 20 cm. The heavy axeblade
is being pressed onto the whetstone with a steady force of 25 N
directed into the centre of the whetstone. Suddenly, the power to the motor is cut but the person maintains
the force of the axe on the whetstone. The coefficient of kinetic friction between the axe and the stone is
0.60. The moment of inertia of a cylinder about it's centre of mass is I = ½MR2.
(a) Calculate the torque of the frictional force on the wheel.
(b) Calculate the total angle through which the wheel turns from the time the power goes off to the time the
whetstone stops rotating.
(c) How long does it take for the wheel to stop after the power outage?
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