# Physics - Mechanics - Circular Motion

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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 5.0 rev/s in 8.0 s. At this point, the person doing the laundry opens the lid and safely switch turns off the washer. The tub slows to rest in 12.0 s. Through how many revolutions does the tub turn during the entire 20-s interval. Assume constant angular acceleration while it is starting and stopping.

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#### Solution Preview

For the start, w1 = 0, w2 = 5 rev/s x 2(pi) radians/rev = 10(pi) = 31.41 rad/s. Angular

acceleration, alpha = (w2 ?w1)/t = 31.41/8 = 3.93 ...

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