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Tension Help

  1. Oct 8, 2007 #1
    [Solved] Tension Help

    Code (Text):

             T2 /
    ---_T1____./ 41*
      B       |
    ---       |
             |  |
             |A |
     
    A and B are blocks. B is stationary on a tabletop. A is hanging off the edge beind held by 2 strings.

    1. The problem statement, all variables and given/known data
    Block B weighs 712N. The coefficient of static friction between block B and the table is 0.25. Find the maximum weight of block A for which block B will remain at rest.


    2. Relevant equations
    F=ma

    3. The attempt at a solution

    Block B:
    [tex]f_{smax}-T_1=0[/tex]
    [tex]f_{smax}=T_1[/tex]
    [tex]f_{smax}=\mu_{smax}m_Bg[/tex]

    Block A
    [tex]T_1-T_2\cos41=0[/tex]
    [tex]T_1=T_2\cos41[/tex]

    I can't figure out what T2 is. I thought at first it would be [tex]m_Ag[/tex] But plugging that in I get mass of Block A is 235.85N but it should be 155N.

    Edit: forgot about the tension between block A and the string holding it up which allowed me to get 154.7~155N when rounded.
     
    Last edited: Oct 8, 2007
  2. jcsd
  3. Oct 8, 2007 #2

    learningphysics

    User Avatar
    Homework Helper

    Look at the knot joining the two ropes..

    write the [tex]\Sigma{F_y} = 0[/tex] equation...
     
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