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Elevator + Counterweight problem

  1. Aug 1, 2015 #1
    1. The problem statement, all variables and given/known data
    The problem is as posted in this picture


    Hey guys/girls, my teacher gave us this problem which I am not sure if I have correct. Could someone please verify if my solution is correct.
    6qw8kl.jpg


    2. Relevant equations

    As in my attempt

    3. The attempt at a solution
    My attempt is scanned - swpnaf.jpg
     
  2. jcsd
  3. Aug 1, 2015 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Welcome to PF!

    Your solution is correct, but you save time both for yourself and for the helpers if you do the solution symbolically, and plug in the data at the end. You would see that the radius of the rotor cancels.
     
  4. Aug 1, 2015 #3
    Thanks!
    Ok, I will do it symbolically next time
     
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