1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Rotational Kinetic

  1. Nov 14, 2006 #1
    Use conservation of energy to determine the angular speed of the spool shown in Figure P8.36 after the 3.00 kg bucket has fallen 4.65 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds.

    I used conservation of energy.
    (KEr + KEt + mgh)i = (KEr + KEt + mgh)f
    0 + 0 + (3 x 9.8 x 4.65) = [.5(.5Mr^2)w^2] + .5(Mv^2) + 0
    136.71 = (.25Mr^2)w^2 + .5Mv^2
    136.71 = (.25 x 5 x v^2) + (.5 x 5 x v^2)
    v = 7.39
    w = 12.324

    The ans is not correct, what am i doin wrong?

    Thank you for lookin but I manage to see my mistake. I used the wrong mass for the KEt

    Attached Files:

    Last edited: Nov 14, 2006
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Rotational Kinetic
  1. Rotational Kinetics (Replies: 4)