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Homework Help: Superhero punching through a wall, breaking point of steel

  1. Nov 4, 2011 #1
    1. The problem statement, all variables and given/known data

    Comic-book superheroes are sometimes able to punch holes through steel walls.
    (a) If the ultimate shear strength of steel is taken to be 2.60X10^9 Pa, what force is required to punch through a steel plate 1.60 cm thick? Assume the superhero's fist has cross-sectional area of 104 cm2 and is approximately circular.

    2. Relevant equations
    Possibly F/A=Y*DeltaL/Linitial

    3. The attempt at a solution

    My attempt was P=F/A 2.6x10^9*(pi.104^2)=88346611.86

    My teacher began doing the problem but got lost and was unsure how to proceed...she said she would have to look into it She gave us the answer which was 10500000N. I got lost with what she was doing and tried my own attempt. Meanwhile, our homework with an identical problem with different numbers is due before our next class. I am completely lost on how to do this problem. I would greatly appreciate help.
  2. jcsd
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