A Machinist Turns the Power on to a Grinding Wheel

question 17

Multiple Choice

A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. The wheel is run at that angular velocity for 37 s and then power is shut off. The wheel decelerates uniformly at 1.5 rad/s² until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to:

• A) 17 s
• B) 15 s
• C) 19 s
• D) 21 s
• E) 23 s

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