Posted by **Chan** on Saturday, November 28, 2009 at 9:56pm.

Hi! I really need help on Part B only.

(a) Calculate the absolute pressure at the bottom of a freshwater lake at a depth of 28.7 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.

(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 40.9 cm?

So, I try to convert 40.9cm to 0.409*9.8 but, it not right.

- physics -
**drwls**, Sunday, November 29, 2009 at 1:26am
Why would you multiply the diameter by g?

Force equals pressure times area.

You are still mispelling the subject.

A "physic" is a laxative.

- physic -
**Mary**, Wednesday, January 26, 2011 at 8:46pm
40.9cm = 0.409m

diameter/2 = radius

0.409m/2 = 0.2045

area of circle = (pi)r^2

F=PA

F=(what you got for pressure from Part A)((pi)r^2)

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