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Angular momentum and change in velocity

  1. Oct 28, 2011 #1
    1. The problem statement, all variables and given/known data

    A turntable has a moment of inertia of 2.5 x 10-2 kg m2 and spins freely at 33.3 rev/min. A 0.25 kg ball of putty is dropped vertically on the turntable at a point 0.20 m from the center. What is the new angular speed of the system?

    a. 41 rev/min
    b. 24 rev/min
    c. 33 rev/min
    d. 27 rev/min


    2. Relevant equations

    L=Iω
    p=mv
    L=r*p

    3. The attempt at a solution

    i tried to do Iω=(I+mr)ω(final)
    i got 27 rev/min
    the real answer is supposed to be 24rev/min according to the answer key
     
  2. jcsd
  3. Oct 28, 2011 #2

    hage567

    User Avatar
    Homework Helper

    Can you show the details of your calculation? We can't tell you what you did wrong if you don't show us your work!
     
  4. Oct 28, 2011 #3
    "i tried to do Iω=(I+mr)ω(final)"

    Careful, mr does not have same units as I.
     
  5. Oct 29, 2011 #4
    Yeah that was my error thanks!
     
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