hmwk2_sp11 - morning? Explain your answer. (HINT: Snow...

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AOS 100/101 Spring 2011 HOMEWORK #2 (Due Fri. February 18) Please provide concise, grammatically correct, neatly written answers to the following questions. All questions can be answered in, at most, a few sentences. Don’t forget to write your name on the paper!!! NAME: 1) Liquid water has the peculiar property that its density is largest at 34ºF. Imagine two adjacent lakes with identical surface areas. One lake is much deeper than the other. A mass of cold air rushes over the lakes in late November. Explain why the surface of the shallow lake freezes first. (HINT: Consider how conduction and convection change the temperature of the lake water). (10 pts.) 2) A sled-dog racer builds three identical igloos. One is used to store her supplies, another houses her team of 12 dogs, and the last one houses her. Which of the three igloos has the warmest internal temperature when she wakes up the next
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Unformatted text preview: morning? Explain your answer. (HINT: Snow behaves like a black-body with respect to infra-red radiation.) (10 pts.) 3) In a lab experiment you note than an object experiences a steady increase in temperature with the passage of time. If that object is absorbing 100 units of radiant energy every second, what must be true about the amount it emits? Explain your answer with reference to the concept of radiative equilibrium . (10 pts.) 4) A friend of yours conducts an experiment in which she places a small beaker of fluid into a larger beaker of fluid and observes changes in the temperatures of the fluids. She tells you that the initial and final conditions of the experiment are represented by the diagrams labeled INITIAL and FINAL in Fig. 1. Is this an accurate statement? How can you be sure? Explain your answer in terms of the Second Law of Thermodynamics. (10 pts.)...
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