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Homework Help: Tensions - Horizontal Surface

  1. Oct 10, 2005 #1
    Hi! If anyone could pass on any hints as to how to go about figuring out this type of problem....thanks!! I just need guidance as to how to determine F... attached is a diagram.

    The horizontal surface on which the object slides is frictionless. If M=4.0kg, the tension in string 1 is 12N. Determine F in N.

    a) 10 b) 20 c) 25 d) 40 e) none of the above
     

    Attached Files:

  2. jcsd
  3. Oct 10, 2005 #2

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    All the blocks are interconnecrted so have the same acceleration. The force F accelerates all three blocks.
    The tension, T1, accelerates the last two blocks with the same acceleration.

    Use newton's 2nd law.
     
  4. Oct 15, 2009 #3
    While we're on the topic of tension (which I never really learned last year in ap physics b), can anyone show me where to start on this problem? I'm really regretting taking ap physics c, but I got a 5 on the exam for b so I can't be that bad, right?
    2hd5mdz.jpg

    I've determined the net force is 45 N and that the acceleration must be 5 m/s2, but that's about it :/
     
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