Intro to Pressure Video Lessons

Concept

# Problem: A submarine is stranded on the bottom of the ocean with its hatch 25.0 m below the surface. Calculate the force needed to open the hatch from the inside, given it is circular and 0.450 m in diameter. Air pressure inside the submarine is 1.00 atm.

###### FREE Expert Solution

Pressure due to the weight of fluid:

$\overline{){\mathbf{P}}{\mathbf{=}}{\mathbf{h}}{\mathbf{\rho }}{\mathbf{g}}}$

The density of seawater, ρseawater =  1.025 × 103 kg/m3

Pwater = (25.0)(1.025 × 103)(9.81) = 2.51 × 105 N/m2

The air pressure inside the submarine cancels out the outside atmospheric pressure.

The net pressure, Pnet = Pwater

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###### Problem Details

A submarine is stranded on the bottom of the ocean with its hatch 25.0 m below the surface. Calculate the force needed to open the hatch from the inside, given it is circular and 0.450 m in diameter. Air pressure inside the submarine is 1.00 atm.