Q.You have a grindstone (a disk) that is 91.0 kg, has a 0.280-m radius, and is...
Q.You have a grindstone (a disk) that is 91.0 kg, has a 0.280-m radius, and is turning at 65.0 rpm, and you press a steel axe against it with a radial force of 13.0 N.
A. Assuming the kinetic coefficient of friction between steel and stone is 0.10, calculate the angular acceleration (in rad/s2) of the grindstone. (Indicate the direction with the sign of your answer.)
B. How many turns (in rev) will the stone make before coming to rest?
Homework Answers
The friction force due to the radial force will provide the
torque for angular acceleration. The angular acceleration is
negative because the disk slows down. Use rotational kinematics
equation to find the number of turns as shown below.
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