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Mechanical Engineering- Stress-Strain

  1. Nov 2, 2014 #1
    When a 90kg man stands on a snow-covered trail, he sinks a certain amount into the snow-covered trail, he sinks a certain amount into the snow because the compressive stress between his boots and the snow is larger than the snow can support without crumbling. Assuming typical cross-country skis are 1.65m long and 6 cm wide, calculate the percentage reduction in stress applied to the snow when he is wearing skis instead of boots(assume a typical snow boot has a sole that is 8cm wide and 25cm long)

    2. Relevant equations
    P=F/A i think ..

    3. The attempt at a solution
    i cannot have any idea for solution can somebody help me :(
  2. jcsd
  3. Nov 2, 2014 #2
    You're using the correct choice of equation. What area does a boot have and what are does a ski have? What force is involved here?

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