Homework Help Forum: math

Posted by mike on Wednesday, November 4, 2009 at 8:38pm.

An object is spinning at 4 rev/s and starts deccelarting at .9 rev/s^2. How long will it take the object to stop?

• math - Reiny, Wednesday, November 4, 2009 at 8:59pm

  a = -.9(2pi) rad/s^2 then v = -.9(2pi)t + c when t=0, v=4(2pi) so c= 8pi then v = (-1.8pi)t + 8pi we want v = 0 0 = (-1.8pi)t + 8pi t = 40/9 seconds or just thinking about it, it loses .9revs per second, so 4/.9 = 40/9 (sometimes thinking within the box gets you trapped in the box)

  
  

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