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Practice-Quiz3

# Practice-Quiz3 - with 3000 parts per million(ppm to a low...

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Physics 7B Practice Quiz 3 DL Section Number ____________ Name (last, first) ____________________________ Student ID _______________________ 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 half of the heat in your home escapes through the roof, and you then improve the insulation in your roof by doubling its thickness, by what factor should your heating bill decrease? Explain in one brief sentence, using the ideas of linear transport. 2. (1.5 pts) Calcium ions diffuse through a permeable membrane separating a high concentration solution
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Unformatted text preview: with 3000 parts per million (ppm) to a low concentration solution near zero ppm. Assume the ion flow rate is I (which has units of ions per second) If we measure the ion transport rate with the same membrane, but from a solution with 3000 ppm on one side and 2500 ppm on the other, what will the new ion flow rate be? Explain your reasoning in one sentence, using the ideas of linear transport. 3. (1.5 pts) On a cold day you go outside and pick up a wooden rod and a metal rod. They are the same temperature, but the metal rod feels much colder. Explain. linear transport: (flow rate) = (driving force)/(resistance) resistance: R = ρ L/A...
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