A machinist turns the power on to a grinding wheel,at rest,at time t = 0 s.The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s.The wheel is run at that angular velocity for 40 s and then power is shut off.The wheel slows down uniformly at 1.5 rad/s² until the wheel stops.In this situation,the time interval of deceleration is closest to: A)64 s B)62 s C)66 s D)68 s E)70 s

Question

Quizplus · Accepted Answer

The time interval of deceleration can be calculated using the formula: time = (final angular velocity - initial angular velocity) / angular deceleration. Here, the final angular velocity is 0 rad/s, the initial angular velocity is 96 rad/s, and the angular deceleration is 1.5 rad/s². Thus, time = (0 - 96) / (-1.5) = 64 s.

A Machinist Turns the Power on to a Grinding Wheel,at