P7-S10-Practice-Final-2

# P7-S10-Practice-Final-2 - Physics 7B Spring 2010 Practice...

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1. Air flows from left to right with no resistance through a downward sloping pipe that has different diameters in two different sections, as shown below. A smaller tube is connected below the pipe and partially filled with water. a) (1.0 pts) Is the kinetic energy density larger at point 1 or 2? Explain in one sentence. The kinetic energy is larger at point 1 due to the continuity equation A 1 v 1 =A 2 v 2 , which implies that the velocity at point 1 is greater since the cross sectional area is less there. b) (1.0 pts) Is the potential energy density larger at point 1 or 2? Explain in one sentence. The potential energy density is higher at point 1, since it’s higher. c) (1.5 pts) Is the pressure higher at at point 1 or 2? Use the Bernoulli equation to determine this, and explain the result in one sentence. We take the difference between point 2 and point 1 to get ( P 2 P 1 )+ ρ 2 ° v 2 2 v 2 1 ± + ρ g ( h 2 h 1 )=0 and since the second and third terms are negative, P 2 > P 1 d) (1.0 pts) Will the water level be higher in the tube below point 1 or below point 2?
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## This note was uploaded on 01/05/2011 for the course PHY 7B PHY7B taught by Professor Cebra during the Spring '10 term at UC Davis.

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P7-S10-Practice-Final-2 - Physics 7B Spring 2010 Practice...

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