A Circular Saw Is Powered by a Motor

question 42

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
• B) 480 J
• C) 960 J
• D) 1400 J
• E) 1800 J

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