Calculating Angular Acceleration of a Washer's Tub

[smd1991]

1. The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.2 revolutions/s in 8.4 seconds. 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 9.5 seconds.
through how many revolutions does the tub turn? assume constant angular acceleration while it is starting and stopping. answer in units of revolution.




i don't even know where to start really, besides finding the angular acceleration

 

[mezarashi]

Do you have the kinematics equations for angular displacement? The process is exactly the same as how you would do it linearly.

1. washing machine starts from rest and goes to a final velocity of 2.2 in 8.4s.
2. washing machine then goes from 2.2 to rest in 9.5s.
3. what is the total distance traveled by washing machine (freaky huh, washing machines that can run out of the house).