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# Ch11 - Chapter 11 Energy in Thermal Processes CHAPTER 11 1...

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Chapter 11, Energy in Thermal Processes C HAPTER 11 1. A 10-kg piece of aluminum (which has a specific heat of 900 J/kg ⋅° C) is warmed so that its temperature increases by 5.0 C ° . How much heat was transferred into it? a. 4.5 × 10 4 J b. 9.0 × 10 4 J c. 1.4 × 10 5 J d. 2.0 × 10 5 J 2. In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse? a. 100% returns to the atmosphere. b. It’s blocked by glass. c. It’s transformed into ultraviolet upon striking the glass. d. It’s reflected as visible light upon striking the glass. 3. Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow? a. gas b. liquid c. solid d. substance undergoing a change of state 4. Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube. By what factor is the rate of heat flow changed when the bar’s cross-sectional area is doubled? 5. Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is tripled? 132

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Chapter 11, Energy in Thermal Processes 6. If one’s hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process? 7. The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process? a. conduction b. radiation c. convection d. vaporization 8. The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through what process? 9. A hot (70 ° C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g ⋅° C. John drops the metal into a 500-g calorimeter containing 75 g of water at 20 ° C. The calorimeter is constructed of a material that has a specific heat of 0.10 cal/ g ⋅° C. When equilibrium is reached, what will be the final temperature? c water = 1.00 cal/g ⋅° C. a. 114 ° C b. 72 ° C c. 64 ° C d. 37 ° C
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