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Cart, Incline, Pulley, and a messed up Acceleration.

  1. Jun 11, 2009 #1
    The question and my work can be seen in the image below:

    http://img145.imageshack.us/img145/550/scan0001fgu.jpg [Broken]

    The problem is that I am getting around 1 for acceleration, while the answer is 0.77.

    What am I doing wrong?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 11, 2009 #2

    rock.freak667

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    Homework Helper

    Last edited by a moderator: Apr 24, 2017
  4. Jun 11, 2009 #3
    Oops, I was using a url from hotmail. It showed up fine for me, but I guess that was because I was logged in at the time.

    Thanks.
     
    Last edited by a moderator: Apr 24, 2017
  5. Jun 11, 2009 #4
    The angle remains 26 and not 64. So Fgx = mass x gravity x sin theta where theta is 26 degrees.
     
  6. Jun 11, 2009 #5
    Fgx = mass x gravity x sin 26

    Fgx = 3.6 x 9.8 x sin 26

    Fgx = 15.465

    This rounds off to 15.5 N, which is what I got.


    NOTE: cos 64 = sin 26
     
  7. Jun 12, 2009 #6
    You have got another force in the rope m2a.
    Your equation should look something like this:

    m2g+m2a+m1a=m1gsin26

    a=(m1gsin26-m2g)/(m1+m2)
    a=0.7728
     
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