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Q1-2 - 2 Grading Rubric for Quiz 1 Question 1 C correct[1.5...

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Physics 7B Quiz 1 Grade: Name: _______________________ ID: _______________________ DL Section: I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit! 1. (1.5 pts) If we have a pipe of cross sectional area 0.25 m 2 , and water is flowing in it with a flow rate of 1.25 m 3 /s, what is the flow velocity of the water? 2. (1.5 pts) All of the water from the large diameter pipe in the previous problem is fed into a larger pipe of cross sectional area 0.5 m 2 . a) What is the flow rate in the larger pipe? b) What is the flow velocity? 3. (1.5 pts) If the pipes in the previous problems lie horizontally, in which pipe is the pressure greater, the larger-area or smaller-area one? Use the Bernoulli equation to determine your answer, and describe the reasoning of your conclusion in one sentence.

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Unformatted text preview: 2 Grading Rubric for Quiz 1 Question 1: C- correct [1.5] M- small math error [1.4] E- incorrect equation (I=1/2(rho*v^2), A=Iv, etc. [1.2] V- interchanged "flow rate" and "flow velocity": used I=Av, but answered I=(.25)(1.25)=.3125 [1.00] X- major conceptual error [0.5] Question 2: C- correct [1.5] M- small math error [1.4] A- A incorrect, B correct [0.75] B- B incorrect, A correct [0.75] R- correct idea, but incorrect formula throughout both parts [1.2] X- major conceptual error- both wrong [0.5] Question 3: C- correct [1.5] A- had delP + delKE/vol = 0 or constant, but used incorrect reasoning to deduce which pressure was higher, resulting in an incorrect answer [1.2] Q- incomplete explanation- but not incorrect [1.0] B- correct answer, no use of Bernoulli's Eq [1.0] S- said pressures would be equal [0.5] X- Major conceptual error, usually resulting in incorrect use of Bernoulli's equation [0.5]...
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Q1-2 - 2 Grading Rubric for Quiz 1 Question 1 C correct[1.5...

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