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A cylindrical centrifuge of mass 8kg and radius 10 cm spins at a speed of 80,000rpm. Calculate the minimum braking torque that must be applied to stop the

rotor within 30 s from the instant the motor is turned off.


Time as given 30s
mass as also given 8 kg
=30×8 =240
motor is turned off on time 240
now radius 30÷2= 15
speed =80000rpm
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