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Help with torque problems

  1. Sep 19, 2011 #1
    1. The problem statement, all variables and given/known data

    I need help with #2 and #5.

    #2 just aks what is the mass of m1, in order for the system to be in static equilibrium

    #5 aks what angle will the disk spin when pushed to go up that step. It also asks what is the minimum force needed in order for the disk to go up.



    3. The attempt at a solution
    I tried solving #2 just like i did with #1. They are giving me 2 sets of distances (in #1 just one) i also tried with the other set of distances and it didnt work. I even tried combinating the 2 sets of distances and not even that works.

    For #5 tried combinating some formulas:

    [itex]\sum[/itex]F
    _______________ = a/r = [itex]\Delta[/itex][itex]\Theta[/itex]/[itex]\Delta[/itex]t
    [itex]\sum[/itex]m

    but all of those unkowns ''freak me out''



    EDIT: and you can see that my teacher has an answer bank, i know that [itex]\Theta[/itex] is obviously 30, but i dont know how to get there

    [Attachment removed as it contains personal information]
     
    Last edited by a moderator: Sep 20, 2011
  2. jcsd
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