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Angular acceleration in revs/s^2

  • Thread starter vorcil
  • Start date
  • #1
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http://img15.imageshack.us/img15/858/masteringf.jpg [Broken]

my attempt,

[tex]\alpha[/tex]= dw/dt

550-150 = 400 rev/min change

400/3.5 = 114 revs

that wasn't right so i tried
114*60, which gives -6857 revs^-2

can someone help please? i'm not sure if i've got this whole revolution thing correct in my head lol
 
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Answers and Replies

  • #2
rl.bhat
Homework Helper
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550-150 = 400 rev/min change
Convert rev/min to rev/s
 
  • #3
393
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550-150 = 400 rev/min change
Convert rev/min to rev/s
why does angular acceleration come out right whether you use Angular velocity or revolutions?

[tex]\alpha[/tex] = w/t

[tex]\alpha[/tex] = revolutions/t
 
  • #4
rl.bhat
Homework Helper
4,433
5
You can express angular velocity either in rev/min or rad/s.
In the problem α should be rev/s^2. So you have to convert rev/min to rev/s.
 

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