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Physics Forces Problem: Helicopter lifting a truck

  1. Mar 25, 2012 #1
    1. The problem statement, all variables and given/known data

    A large (15,000-kg) military helicopter lifts a 6000-kg truck straight up out of a danger zone with an acceleration of 4 m/s2. Calculate the tension in the lifting cable.

    2. Relevant equations

    F = ma
    W = mg


    3. The attempt at a solution
    I believe T = 8.3 * 104N, but I am unsure.
    For the truck: ƩFy = -mg + T = mtruck * a = 24000
    T = 24000 + mtruckg = 24000 + (6000 * 9.8) = 8.3 * 104N
     
  2. jcsd
  3. Mar 25, 2012 #2

    rock.freak667

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    Homework Helper

    I think your equation should be

    mhelia = T-mtruckg

    As I am assuming that the helicopter is now lifting the truck off of the ground.
     
  4. Mar 25, 2012 #3
    Why would it be mhelia instead of mtrucka? That doesn't make much sense to me.

    The forces acting on the truck are gravity and tension, so
    ƩFon truck = T - mtruckg = mtrucka
     
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