Quiz1-Sol-SSI09_000

Quiz1-Sol-SSI09_000 - Physics 2C Summer Session I - 2009...

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Physics 2C Summer Session I - 2009 Quiz #1 Multiple Choice. Choose the answer that best completes the statement or answers the question. 1. Assuming that one atmosphere of pressure is equal to 10 5 Pa; the density of sea water is = 1 : 03 gm=cm 3 ; and the acceleration of gravity is g = 9 : 8 m= sec 2 ; calculate the depth of water that is required to produce an additional one atmosphere of pressure. A) 9 : 91 m B) 10 : 2 10 3 m C) 10 : 2 m D) 9 : 91 10 3 m E) 9 : 8 m . The change in pressure is given by P = = 10 5 = 1030 9 : 8 h h = 10 5 1030 9 : 8 = 9 : 907 m ! A = 1 gm=cm 3 ; to a depth of 2 m . At the bottom there is a hatch 1 m high and 2 m wide. Assuming an atmospheric pressure of P 0 = 10 5 Pa and the acceleration due to gravity of g = 10 m=s 2 ; determine the net force on the hatch. Hint, the atmospheric pressure acts on both sides of the hatch. Problem 2 A) 2 10 4 N B) 40 N C) 3 10 4 N D) 4 10 4 N E) 30 N Since the atmospheric pressure cancels, the net force on the hatch is due to the pressure of the water, which is given by P = (1) + &gh; 1
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where h is measured from the top of the hatch. The total force is F = Z PdA = Z 1 0 ( (1) + ) Wdh F = + 1 2 = 3 2
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Quiz1-Sol-SSI09_000 - Physics 2C Summer Session I - 2009...

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