A Circular Saw Is Powered by a Motor

question 68

Multiple Choice

A circular saw is powered by a motor.When the saw is used to cut wood, the wood exerts a torque of 0.80 N∙m on the saw blade.If the blade rotates with a constant angular velocity of 20 rad/s the work done on the blade by the motor in 1.0 min is:

• A)0 J
• B)480 J
• C)960 J
• D)1500 J
• E)1800 J

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