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Determine the Maximum angular velocity

  1. May 11, 2009 #1
    1. The problem statement, all variables and given/known data

    The 10-lb slender rod AB is welded to the 6-lb uniform disk, which rotates about a pivot at A. A spring of constant k = 4.5lb/ft is attached to the disk and is unstretched when rod AB is horizontal. The assembly is released from rest in the position shown. Calculate and plot the angular velocity of the assembly after it has rotated through an angle θ, for values of θ from 0 to θm, the angle of maximum rotation. Determine the maximum angular velocity of the assembly and the corresponding values of θ.


    Any help as to how to go about solving this would be greatly appreciated. I don't need it solved for me but info on how to set up the problem again would be appreciated. Thanks!

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. May 11, 2009 #2


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    Homework Helper

    I'd start with a free-body diagram, but instead of forces, display torques about the fixed point at the center of the disk. Then add up all the torques to find the total torque on the assembly, and plug into [tex]\tau = I \ddot\theta[/tex] to get a differential equation for the angle.
  4. May 14, 2009 #3
    Hey plzz
    help me

    Is the work done min circular motion zero????

    next question:
    What is the displacement of the blade of a fan when it worksss???
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