Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Where do you keep the weight?

  1. May 15, 2005 #1

    If there is a triangular hard base (but light in weight) which is hanging from three wires.Two of these wires are made from copper and the other is made out of iron. If some weight is kept on top of the base and the wires stretch, how do you find the place where you have to keep the same weight to keep the whole structure balanced?
  2. jcsd
  3. May 15, 2005 #2
    How about using the Young's Modulus of the materials to work it out?

    Modulus = Stress/Strain

    Stress = Force/cross sectional area
    Strain = Extension/original length

    You should be able to obtain all the data you need to calculate the relative extension of each wire. If you want to keep this constant, you can work out the force required on each wire, and hence where to put the weight.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook