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Can you help me find what a = on this problem?

  1. Jun 3, 2013 #1
    550615.jpg

    Sorry about bad picture. I did best I could but I am not sure that's how I do this problem.
    If I am wrong can you give me right equations for this? Thank you. :)
     
    Last edited: Jun 3, 2013
  2. jcsd
  3. Jun 3, 2013 #2
    about a

    can you specify which block has acceleration 'a'.
     
  4. Jun 3, 2013 #3
    i have no clue. That's how my teacher wrote the problem as take home problem. He just had pictures and what is a = ? I think he meant total acceleration. He gave us similar problems few weeks ago but it was on two boxes without mk instead of box and triangle with mk. So I used formula to find acceleration of each blocks and found T1 and T2 and then applied to same formula he used on the problem he did few weeks ago. :(
     
  5. Jun 3, 2013 #4
    a

    a should be 15/4.
    (i used g=10 not 9.8)
    the acceleration of each block is the same.
     
    Last edited: Jun 3, 2013
  6. Jun 3, 2013 #5
    hmm.. 15/4? how did you end up with that?
     
  7. Jun 3, 2013 #6
    explanation

    T1=10a
    T2-10gsin30=10a
    20g-(T1+T2)=20a

    solve these to find "a".
     
  8. Jun 3, 2013 #7
    err.. I can't really tell how your equation works with that 3 short equations. Did you use mk = .1 and mk = .2 on each side to get the answer?
     
  9. Jun 3, 2013 #8
    reply

    do you know the newtons second law.
    ƩFx=max
    ƩFy=may

    first draw the free body diagram of each block and then apply these eqns to get my above eqns
     
  10. Jun 3, 2013 #9
    but you sure it's 15/4 not 15/40? when I plug in my t1 and t2 and solve for a using your 3 line equation, I get 15/40
     
  11. Jun 3, 2013 #10
    yes

    yes it is 15/4 only
     
  12. Jun 3, 2013 #11
    yes

    thats correct
     
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