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A large grindstone wheel ( a solid cylindrical disk made of stone) has a mass of 30 kg. and a radius of 50 cm. It is spinning at an angular rate of 90 rev./min. A brake is applied at the edge of the disk and pushed against it with a force of 25 newton. If the brake coefficient offriction is u=.65,
a) what is the torque acting on the wheel?
b) what is the angular acceleration of the wheel?
c) How many complete revolutions does it turn through before stopping?
Consider an electromagnetic made from a solenoid, hooked to an EMF source. compute the strength of the magnetic field inside the solenoid
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