Total pressure of water against submarine

[chawki]

Homework Statement

What is the total pressure (absolute pressure) against the porthole of a submarine, when the
submarine is at a 35 m depth, and the density of the seawater is 1020 kg/m3. Air pressure is 1
bar and 1 bar = 1×105 Pa. Give the result using unit bar.

Homework Equations

Total Pressure

The Attempt at a Solution

PV=nRT ?

 

[rock.freak667]

The Attempt at a Solution

PV=nRT ?

That is for gases.

What is the equation for the pressure given at a certain depth in a fluid? (Hint: The question has most of the relevant quantities that you need in this question)

 

[chawki]

I don't know the equation, and couldn't get anything from the question..except the difference of pressure.

 

[chawki]

ah yesyes...maybe P=density*g*height

 

[rock.freak667]

ah yesyes...maybe P=density*g*height

Right that gives the pressure at the depth 'h'. So at depth 'h', you have that pressure acting in addition to what other pressure?

 

[chawki]

I think the Total pressure would be:
P_total=P₀+P
P_total=10⁵+(1020*9.8*35)
P_total=449860 Pa
and that's 4.4986 Bar

 

[rock.freak667]

That should be correct.

 

[chawki]

Thank you