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Homework Help: Stress-strain problem

  1. Sep 16, 2014 #1
    A cylindrical steel rod is originally 250 cm long and has a diameter of 0.254 cm. A force is applied longitudinally and the rod stretches 0.85 cm. What is the magnitude of the force? The value for Young's Modulus for steel is 200*109 Pa.
    The correct answer is 3400 N, i used the equation F/A=Y(ΔL/L0) but kept getting some weird numbers. I think I'm screwing up on finding the area, since in most of the problems the area is already given. Can someone help me figure this out?
  2. jcsd
  3. Sep 16, 2014 #2


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    Staff Emeritus
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    Things will go much easier if you post your calculations, so says the Magic 8-Ball. :smile:
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