Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Torque Problem

  1. Feb 26, 2008 #1
    Torque/Translational and Rotational Equilibrium

    I was given this problem as a quiz in class. Unfortunately, I did not finish it. I decided to try it at home as I need the practice.

    1. The problem statement, all variables and given/known data
    Sorry for the crudely drawn image.
    http://image.bayimg.com/lajgkaabb.jpg [Broken]

    Find: [tex]T, T_2y, T_3y, T_3x[/tex] given [tex]T_2y = T_3y[/tex] and the object is in translational and rotational equilibrium.

    Figure of problem also attached.

    2. Relevant equations

    Don't think there are any.

    3. The attempt at a solution

    Sum of all forces is zero.

    [tex]\Sigma x = T_3x + -T\cos30^\circ = 0[/tex]
    [tex]\Sigma y = 2T_2y + T\sin30^\circ - 500N = 0[/tex]

    Sum of torque is zero.

    [tex]\Sigma\Gamma = -(4m)(2T_2y) + (1.75m)T_3x + (2m)(500N)[/tex]

    Substitution time?

    [tex]T_3x = T\cos30^\circ[/tex]
    [tex]T_2y = \frac{500N - T\sin30^\circ}{2}[/tex]
    [tex]0N = -(4m)(500N - T\sin30^\circ) + (1.75m)(T\cos30^\circ) + 1000N[/tex]
    [tex]0N = -1000N + 3.516T[/tex]

    Proposed values

    [tex]T = 284.414N[/tex]
    [tex]T_3x = 246.31N[/tex]
    [tex]T_2y = T_3y = 178.896N[/tex]

    I just want to know if I did this correctly. If not, I would greatly appreciated any help. Thanks for taking the time to read this.

    Attached Files:

    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Feb 26, 2008 #2
    Sorry to bump my own thread... I just want to know if I did the problem correctly...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook