Angular Deceleration Homework: 1200 Revs in 40s

AI Thread Summary
The discussion revolves around calculating the angular deceleration and initial angular speed of a circular saw blade that completes 1200 revolutions in 40 seconds while coasting to a stop. Participants emphasize the importance of using kinematic equations that incorporate time, angular displacement, and the final angular speed, which is zero. The initial angular speed is derived from the total revolutions converted into radians, leading to a calculation of angular acceleration. Confusion arises regarding the correct interpretation of angular displacement and the relationship between average and initial angular velocities. Ultimately, the group arrives at a consensus on the correct approach to solve for both angular acceleration and initial speed.
  • #51
and now i used pie=a and solved for the angular velocity, which i had gotten before to be equal to 40*pie...agreed??
 
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  • #52
my fault, i checked it over again and now i got -3pie = angular acceleration. Would you guys at least tell me if i am on the right track or not?
 
  • #53
xXmarkXx said:
my fault, i checked it over again and now i got -3pie = angular acceleration. Would you guys at least tell me if i am on the right track or not?

Yes, you appear to be on the right track.
 
  • #54
and then i got 120pie = w0
how bout that? correct o mundo? Thanks hage and werg for the help and being patient with me. I'm a slow learner.
 
  • #55
Looks good to me.

You're welcome. :smile:
 

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