College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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 a safety 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.

To determine
The total number of revolutions the tub undergo in the entire accelerating and decelerating process.


Given info: The tub accelerates from rest to 5.0revs-1 in a time interval of 8.0s . Then the tub decelerates to rest in 12.0s . The angular acceleration in the entire process is constant.


The angular displacement in an interval is defined as,


  • ωf is the final angular velocity in the interval
  • ωi is the initial angular velocity in the interval
  • t is the time interval

For the accelerating interval, substitute 5.0revs-1 for ωf , 0 for ωi and 8.0s for t to determine the angular displacement,


For the decelerating interval, substitute 0 for ωf , 5

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