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April 19, 2014

Homework Help: PHYSICS (CHECK WORK)

Posted by Amy on Wednesday, November 7, 2012 at 11:39pm.

Can somebody please check my work. I got part a right, but my answer for part b is wrong.
(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 25.6 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa.
352180 Pa

(b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 33.1 cm?

diameter=33.1cm
r=1/2 diameter
area=pi*r^2
area=pi(16.55)^2
area=860.49
Force=Ptotalx area
Force=303047368.2

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