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Guillotine problem

  1. Dec 3, 2009 #1
    1. The problem statement
    ScannedImage.jpg

    http://i868.photobucket.com/albums/ab249/sheldonsimon/ScannedImage.jpg" [Broken]
    2. Relevant equations

    I=.5MR^2

    3. The attempt at a solution

    mgh + .5mv^2 + Iw^2 = mgh + .5mv^2 + Iw^2

    v=rw

    I don't know if this is right or not.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Dec 3, 2009 #2

    rl.bhat

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    First of all using Newton's law and torque find the acceleration of the masses.
     
  4. Dec 3, 2009 #3
    can you explain that a little more. I'm sorry
     
  5. Dec 3, 2009 #4
    It would be 6m/s2 right?
     
  6. Dec 3, 2009 #5

    rl.bhat

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    Show your calculations.
     
  7. Dec 3, 2009 #6
    (M1+M2)a = M1(9.8) + M2(-9.8)

    (20+5)a = 20(9.8) - 5(9.8)

    a = 6
     
  8. Dec 3, 2009 #7

    rl.bhat

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    No. It is not correct.
    Let T1 be the tension in the right segment of the string and T2 that of the left segment.
    Then T1 - m1*g = m1a----(1)
    R*(T2 - T1) = I*α-----(2)
    m2*g - T2 = m2*a.----(3)
    Substitute the values of I and α, and solve the equations to find a.
     
  9. Dec 3, 2009 #8
    Thank you so much. You are a life saver.
     
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