The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 7.00 s, at which time it is turning at 5.00 rev/s. At this point, the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub smoothly slows to rest in 14.0 s. Through how many revolutions does the tub turn while it is in motion?

The no. of revolutions does the tub turn while it is in motion is = 52.51 revolutions

Explanation:

Given data

= 0

= 5

Time taken = 7 sec

(1). The angular acceleration is given by

We know that from the equation of motion

 -------- (1)

(2). The angular acceleration is given by

- 0.357

We know that from the equation of motion

= 35.01 rev  -------  (2)

Total no of revolution made by the machine is

17.5 + 35.01

52.51 rev

Therefore the no. of revolutions does the tub turn while it is in motion is = 52.51  rev

second mirror gathers light from a faraway object and reflects it to another mirror. - a.