31. The bars in the drawing above are magnets. According to Chapter 21, which of

Question

31. The bars in the drawing above are magnets. According to Chapter 21, which of the following picture(s) is true? Explain. Then explain why the other 2 pictures are incorrect. Make sure to explain all 3 sets. 32. Based on how the book describes a heat pump in Sec 16.3, how does a heat pump prove the law of conservation of energy? Hint: think about a refrigerator bird flies from the South Pole to the North Pole. Part of the journey is 1000 miles that takes 2 33. A weeks. What is the bird's velocity in that time? Show work for credit and include final units.

Explanation / Answer

32] Using the example of a Carnot engine, the efficiency of such an engine is given by:

E = 1 - [T2/T1]

where T2 is the temperature of the sink (cold body) and T1 is the temperature of the heat source (hot body)

since, T2 < T1 therefore T2/T1 < 1

therefore, E < 1 or E < 100%

which implies that the maximum efficiency achievable is 100% thus indicating that the energy cannot be created without the loss of energy somewhere else(since this will imply E > 100%).

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