# Fluids, Pressure on a Person?

1. Apr 4, 2010

### jumbogala

1. The problem statement, all variables and given/known data
What pressure does a person standing on the ground exert?

2. Relevant equations

3. The attempt at a solution
This has something to do with fluids, but I'm not sure what!

I think I should model the person as a cylinder and find the pressure on the person, then find what the pressure is on the ground?

I really have no idea, that was just a guess. I don't know how to find the pressure on the person either...

Can anyone please get me started?

Last edited: Apr 5, 2010
2. Apr 4, 2010

### jumbogala

Okay so I found this F = p*a

Last edited: Apr 5, 2010
3. Apr 4, 2010

### jack action

The force would be her weight (not her mass) and the area would be the one under her feet. Find the pressure.

4. Apr 4, 2010

### jumbogala

I think I'm confused about the set up of the problem.

Force = 80 kg * 9.81 m/s^2

Area = area of top or bottom of cylinder?

then use F = area * pressure to find pressure?

So this has nothing to do with air pressure at all? Just confused because it's in with a bunch of other problems dealing with pressures from fluids, and I thought maybe air pressure contributes somehow.

5. Apr 4, 2010

### jack action

The way I understand it, it has nothing to do with fluid. Just estimate the area under the feet of Emma (that's why the problem ask for an estimation of the pressure) and then use F = PA.