Pressure Underwater Homework: Calculate Force for Submarine Porthole

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Homework Help Overview

The discussion revolves around calculating the absolute pressure at a depth of 500 meters in the ocean and determining the force exerted by water on a submarine porthole. The subject area includes fluid mechanics and pressure calculations.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculation of pressure and force, with one participant expressing confusion about their initial calculation. There is a focus on the area calculation for the circular porthole, with suggestions to clarify the formula used.

Discussion Status

The discussion is active, with participants providing guidance on the area calculation for the porthole. There is acknowledgment of an error in using the diameter instead of the radius, and alternative methods for calculating the area are being explored.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information they can use or assumptions they can make.

vipertongn
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Homework Statement


(a) Calculate the absolute pressure at an ocean depth of 500 m. Assume the density of sea water is 1024 kg/m3 and that the air above exerts a pressure of 101.3 kPa. --I got this one its 5118900 Pa or N/m

(b) At this depth, what force must the frame around a circular submarine porthole having a diameter of 28.0 cm exert to counterbalance the force exerted by the water?

Homework Equations



F=PA

The Attempt at a Solution


F= (5118900)(pi*.28^2)=1.26e6

Thing is this is wrong and I have no idea why. Can someone enlighten me?
 
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Check your area of the circle equation. I think you are missing something there.

Thanks
Matt
 
OH gosh i put in the diameter rather than the radius thanks so much
 
Or you can keep the diameter. It is simply (pi*D^2)/4

Thanks
Matt
 

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