Posted by **Amanda** on Monday, May 4, 2009 at 10:46pm.

Ans in revs.

The tub of a washer goes into its spin-

dry cycle, starting from rest and reaching an

angular speed of 5 rev/s in 10.5 s . At this

point the person doing the laundry opens the

lid, and a safety switch turns off the washer.

The tub slows to rest in 5.6 s .

Through how many revolutions does the

tub turn? Assume constant angular accelera-

tion while it is starting and stopping. Answer

in units of rev.

- Physics -
**drwls**, Monday, May 4, 2009 at 11:13pm
While accelerating, the washer has an average speed of 2.5 rev/s and goes through 2.5x10.5= 26.25 revs.

While decelerating, it has the same average speed for 5.6 s, and turns 14 revs.

Add the two.

- Physics -
**ronan**, Wednesday, May 30, 2012 at 2:07pm
how did you get the 2.5 rev/s

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