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Homework Help: Mass of the pulley

  1. Oct 21, 2009 #1
    1. The problem statement, all variables and given/known data

    The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in Figure 10-23 are released from rest, with m1 at a height of 0.92 m above the floor. When m1 hits the ground its speed is 1.1 m/s. Assume that the pulley is a uniform disk with a radius of 12 cm.

    Determine the pulley's mass.

    2. Relevant equations
    Conservation of Energy Ef=Ei
    K= 1/2mv2+1/2Iw2 (w = omega)
    I = 1/2mr2

    3. The attempt at a solution

    I tried to cancel out as much as I could form the "K" equation and fill it in. Webassign keeps determining my answer wrong....

    Attached Files:

  2. jcsd
  3. Oct 22, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Show what you did. Hint: Don't forget gravitational potential energy.
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