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Homework Help: What is the net torque on the pulley about the axle

  1. Oct 13, 2007 #1
    1. The problem statement, all variables and given/known data

    What is the net torque on the pulley about the axle if T1 = 18N and T2 = 34N?

    2. Relevant equations

    3. The attempt at a solution

    Torque is really confusing me. I have no ideas as to how to start this problem.
  2. jcsd
  3. Oct 13, 2007 #2
    You're gonna have to show some work, but to "push" you along... could you get started if there were only 1 force?
  4. Oct 13, 2007 #3
    I know that torque = r(Ft), but I don't know if that's the right equation to use.
  5. Oct 14, 2007 #4
    I'm guessing that Ft is the force that is perpendicular to the radius. Is that what you mean? If so, that is the right equation.

    To give a longer answer than you might want,
    Torque = force x radius x sine of the angle between the force and the radius.
    In many cases, the angle is 90 degrees (it certainly is in your picture) and sin(90) = 1, so torque = force x radius in those cases.

    So, now can you calculate the two torques, ONE AT A TIME, including whether it goes clockwise (CW) or counterclockwise (CCW)?
  6. Oct 14, 2007 #5
    I figured it out before looking at your last post. Thanks though!
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