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Help with Tension

  1. Oct 9, 2007 #1
    1. The problem statement, all variables and given/known data
    A 15,000 kg helicopter lifts a 4500 kg truck with an upward acceleration of 1.4 m/s2.
    Calculate (a) the net upward force on the helicopter blades from the air and (b) the tension in
    the cable between helicopter and truck.

    2. Relevant equations

    T = mg

    3. The attempt at a solution

    I was able to calculate the upward force, but I am having difficulty finding out how to calculate the tension. I know that the truck is pulling the heli with the force of gravity, and the helicopter is pulling the truck with the upward force. But how do I relate the two?
  2. jcsd
  3. Oct 10, 2007 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Hint: If the truck was sat on the [frictionless] ground, how much force would be required to accelerate it at 1.4m.s-2? What is the weight of the truck? How do you sum forces?
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