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Solving for tension

  1. Sep 25, 2011 #1
    1. The problem statement, all variables and given/known data

    A helicopter is lifting two crates simultaneously. One crate with a mass of 120 kg is attached to the helicopter by cable A. The second crate with a mass of 76 kg is hanging below the first crate and attached to the first crate by cable B. As the helicopter accelerates upward at a rate of 1.2 m/s2, what is the tension in each of the two cables?


    I dont understand how to solve this at all can you please help ??
     
  2. jcsd
  3. Sep 25, 2011 #2

    Doc Al

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    Staff: Mentor

    Draw a free body diagram for each crate. What forces act on each? Then apply Newton's 2nd law.
     
  4. Sep 25, 2011 #3
    -mg+Tb=ma
    76(1.2+9.8)= 836 N For Crate B

    Ta=ma+mg+836
    =120(1.2+9.8)+836
    =2156 N

    Are these answers correct?
     
  5. Sep 25, 2011 #4

    Doc Al

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    Staff: Mentor

    Yes! :approve:
     
  6. Sep 25, 2011 #5
    Thank you!!!
     
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