Mechanical Engineering- Stress-Strain

[Dominquez]

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)

Homework Equations

P=F/A i think ..

The Attempt at a Solution

i cannot have any idea for solution can somebody help me :(

 

[Chestermiller]

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?

Chet