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Quiz1A

# Quiz1A - Physics 7B-A Codes grading use only Quiz 1 DL sec...

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1• 2• h = 4.0 m v = 8.0 m/s Physics 7B-A Quiz # 1 DL sec: Name: 1/16/08 last, first Codes: grading use only 1• 1.) A pipe with uniform cross sectional area is initially horizontal and rises from to a height 4.0 m above its initial height as shown. The fluid flowing in the pipe is incompressible and any dissipation can be ignored. The initial speed of the flow at point (1) is 8.0 m/s. ® = 900 kg/m 3 a) (50%)What can you determine about the speed of the flow at point (2)? dV dt = vA õ v 1 A 1 = v 2 A 2 . We are given A 2 = A 1 õ v 1 = v 2 , Rubric Question 1: 5 pt (I) - Applied I=Av to find the velocity remains constant 2.5 pt (A) - Found that the velocity remains constant for either the wrong reason or no reason 0 pt (V) - Fundamental error in reasoning or no answer given b) (50%) What can you determine about the pressures at points (1) and (2)? Using our energy density model, 1 2 ρ v 1 2 + ρ gh + P 1 = 1 2 ρ v 2 2 + ρ gh + P 2 . The change in kinetic energy density is zero because there is no change in speed, and taking our zero point for potential energy to

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