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Homework Help: How much does cable stretch?

  1. Feb 17, 2014 #1
    1. The problem statement, all variables and given/known data
    A 1.25m diameter wrecking ball hangs motionless from a 1.75 cm diameter cable. The wrecking ball is solid and is constructed of steel (density = 7800 kg/m3). If the cable is 16 m long, how much does the cable stretch? For the cable use E = 175 GPa.

    2. Relevant equations

    3. The attempt at a solution


    =78171.66 N


    E=175000 N-m^2

    L=16 m

    When I plug in the values I get 29779.68 m which I know cannot be correct.

    Thanks for your time
  2. jcsd
  3. Feb 17, 2014 #2
    Look up what G in GPa signifies.
  4. Feb 17, 2014 #3
    I've been working on this problem for 3 hours now because I failed to realize my simple mistake. Thank you a lot.
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