An electric motor drill, rated 350 W has an efficiency of 35%. The torque produced, if
it is working at 3000 rpm.
a) 0.25 Nm
b) 0.35 Nm c) 0.39 Nm d) 0.30 Nm
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Answer: Power output of drill = 0.35*350 = 122.5W
Angular velocity = 2*3.14*3000/60 = 314 rad/s
Torque = Power/angular velocity = 122.5/314 = 0.39Nm
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