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Virtual works

  1. Jan 11, 2012 #1
    The request is to calcutate the acceleration o the body 1.Making referement to the figure, I have to ignore the spring at first.
    My solution is:
    [tex]a_1=g[2m_1+2m_2-4m_4sin(p)]/(2m_1+3m_2+4m_3+12m_4)[/tex]
    that cames from:
    [tex]m_1gdx+m_2gdx-m_4gsin(p)(2dx)=m_1a+((3/2)m_2R_2^2/4R_2^2)4adx+(1/2)m_3R_3^2/R_3^2(4adx)+(3/2)m_4R_4^2/(R_4^2)(4adx)[/tex]
    since [tex]dx_2=dx_3=dx_4=2dx_1[/tex]

    The "right" result is:
    [tex]a_1=g[4m1+4m2-8m4sin(p)]/(4m1+3m2+4m3+12m4)[/tex]

    I think that my error lies in the calculum of the equivalent masses! :( Can someone help me?
     

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    Last edited: Jan 11, 2012
  2. jcsd
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