Question
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.
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.
Answers
drwls
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.
While decelerating, it has the same average speed for 5.6 s, and turns 14 revs.
Add the two.
ronan
how did you get the 2.5 rev/s