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115Bex1win08verDsol

# 115Bex1win08verDsol - Name last first Student ID Number air...

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Name ___________________________________ Student ID Number ____________ last first I. A pump (not shown) pulls water through a tube from point Q past point R. The tube radius changes from 21 . 0 cm at Q to 5 . 00 cm at R. Point Q is 81 . 0 cm below water level in a large lake. Point R is 39 . 0 cm above the lake. P 0 = 1 . 013 × 10 5 Pa. The water has constant density 1000 kg/m 3 , and is known to have speed 14 . 0 cm/s at point Q. Ignore turbulence, viscosity, etc., and assume ideal flow conditions. Use g = 9 . 81 m/s 2 . water level air P 0 Q 81 cm 39 cm R 1. (5 pts) Which choice best represents the area (cross-section) of the tube at point R? 1 . 96 × 10 -3 m 2 1 . 96 × 10 -1 m 2 7 . 85 × 10 -3 m 2 1 . 81 × 10 -1 m 2 none of these A B C D E π r 2 2. (5 pts) Which choice best represents the pressure at point Q? 9 . 34 × 10 4 Pa 9 . 96 × 10 4 Pa 1 . 03 × 10 5 Pa 1 . 09 × 10 5 Pa 8 . 96 × 10 5 Pa A B C D E Bernoulli relates pressures at R and Q 3. (5 pts) Which choice best represents the water speed at point R? 3 . 00 m/s 0 . 624 m/s 2 . 47 m/s 3 . 25 m/s 4 . 30 m/s A B C D E A 1 v 1 = A 2 v 2 Physics 115B, Winter 2008, version D Exam 1, page 1

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