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Rotating Disc with central hole

  1. Dec 11, 2015 #1
    1. The problem statement, all variables and given/known data
    Problem and worked Example

    Qw3ZCzW.jpg

    2. Relevant equations
    In worked example 1. Problem

    3. The attempt at a solution
    oEGXtEi.jpg

    It's the part where I'm subtracting one stress from the other stress. I put it in parenthesis on the worked example. I don't think my method here is right, I've tried to subtract each like term from the other to get my B term. When I come to extract the 3.3/8 by 3.3/8 it should be 3.3/8 - (-3.3/8) giving + 3.3/8.

    Also why is the radius term now divisible by the variables on the right?

    Can anyone see what's going on here?
     
  2. jcsd
  3. Dec 16, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
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