Physics for Scientists and Engineers 8ed - ch20 - end of chapter questions

# Physics for Scientists and Engineers 8ed - ch20 - end of chapter questions

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Questions W denotes answer available in Student Solutions Manual/Study Guide; O denotes objective question 1. Clearly distinguish among temperature, heat, and internal energy. 2. O Ethyl alcohol has about half the specific heat of water. Assume equal amounts of energy are transferred by heat into equal-mass liquid samples of alcohol and water in separate insulated containers. The water rises in temperature by 25°C. How much will the alcohol rise in temperature? (a) 12°C (b) 25°C (c) 50°C (d) It depends on the rate of energy transfer. (e) It will not rise in temperature. 3. What is wrong with the following statement: “Given any two bodies, the one with the higher temperature contains more heat.” 4. O Beryllium has roughly one-half the specific heat of liquid water (H 2 O). Rank the quantities of energy input required to produce the following changes from the largest to the smallest. In your ranking, note any cases of equality. (a) raising the temperature of 1 kg of H 2 O from 20°C to 26°C (b) raising the temperature of 2 kg of H 2 O from 20°C to 23°C (c) raising the temperature of 2 kg of H 2 O from 1°C to 4°C (d) raising the temperature of 2 kg of beryllium from - 1°C to 2°C (e) raising the temperature of 2 kg of H 2 O from - 1°C to 2°C 5. Why is a person able to remove a piece of dry aluminum foil from a hot oven with bare fingers, whereas a burn results if there is moisture on the foil? 6. The air temperature above coastal areas is profoundly influenced by the large specific heat of water. One reason is that the energy released when 1 m 3 of water cools by 1°C will raise the temperature of a much larger volume of air by 1°C. Find this volume of air. The specific heat of air is approximately 1 kJ/kg · °C. Take the density of air to be 1.3 kg/m 3 . 7. O Assume you are measuring the specific heat of a sample of originally hot metal by the method of mixtures as described in Example 20.2. Because your calorimeter is not perfectly insulating, energy can transfer by heat between the contents of the calorimeter and the room. To obtain the most accurate result for the specific heat of the metal, you should use water with which initial temperature? (a) slightly lower than room temperature (b) the same as room temperature (c) slightly above room temperature (d) whatever you like because the initial temperature makes no difference. 8. Using the first law of thermodynamics, explain why the total energy of an isolated system is always constant. 9. O A person shakes a sealed insulated bottle containing hot coffee for a few minutes. (i) What is the change in the temperature of the coffee? (a) a large decrease (b) a slight decrease (c) no change (d) a slight increase (e) a large increase (ii) What is the change in the internal energy of the coffee? Choose from the same possibilities. 10.

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## This note was uploaded on 05/22/2010 for the course PHYS 2326 taught by Professor Staff during the Summer '08 term at HCCS.

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Physics for Scientists and Engineers 8ed - ch20 - end of chapter questions

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