Angular Velocity and Angular Acceleration help!

  • Thread starter layla2525
  • Start date
  • #1
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Homework Statement



Consider four situations: I) a fan's rotation is speeding up while going in the clockwise direction; II) it is speeding up while going in the counterclockwise direction; III) it is slowing down while going in the clockwise direction; and IV) it is slowing down while going in the counterclockwise direction. In which cases is the angular acceleration positive?

I & II

III & IV

II & III

I & IV

Angular acceleration is always positive


Homework Equations



I know that angular counter clock wise acceleration is positive and clockwise is negative...

The Attempt at a Solution

 

Answers and Replies

  • #2
537
1
so what do you think the correct answer is
 
  • #3
19
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2 and 3
 
  • #4
537
1
2 and 3

so like is that a guess or do you have reasons for picking those?
 

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