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Temperature Changes, Freezing Lakes, and Heat Transfer

Explore temperature changes, freezing lakes in winter, and heat transfer through conduction, convection, and radiation.

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Temperature Changes, Freezing Lakes, and Heat Transfer

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  1. Which one of the following temperature changes represents the largest amount of cooling? (A) –10° C. (B) –10 K. (C) –10 F (D) A & B (E) A & C

  2. At what temperature Celsius and Fahrenheit have the same reading? • –10°C/F • –40 °C/F (C) 0 (D) 100 °C/F (E) Let me get back to you.

  3. Why do lakes freeze over in the winter time? (A) Water at the bottom has higher density and higher temperature. (B) Water at the bottom has higher density and lower temperature. (C) Water at the bottom has lower density and higher temperature. (D) Water at the bottom has lower density and lower temperature. (E) It is simply too cold up there.

  4. Why do lakes freeze over in the winter time? (why don’t lakes freeze from bottom up) (A) Water at the bottom has higher density and higher temperature. (B) Water at the bottom has higher density and lower temperature. (C) Water at the bottom has lower density and higher temperature. (D) Water at the bottom has lower density and lower temperature. (E) It is simply too cold up there.

  5. A solid object has a hole in it. Which of these illustrations more correctly shows how the size of the object and the hole change as the temperature increases? #1 #2 A. #1 B. #2 C. The answer depends on the material of which the object is made. D. The answer depends on how much the temperature increases. E. Both C and D are correct.

  6. A17.4 You wish to increase the temperature of a 1.00-kg block of a certain solid substance from 20°C to 25°C. (The block remains solid as its temperature increases.) To calculate the amount of heat required to do this, you need to know A. the specific heat of the substance. B. the molar heat capacity of the substance. C. the heat of fusion of the substance. D. the thermal conductivity of the substance. E. more than one of the above

  7. Q17.5 A pitcher contains 0.50 kg of liquid water and 0.50 kg of ice at 0°C. You let heat flow into the pitcher until there is 0.75 kg of liquid water and 0.25 kg of ice. During this process, A. the temperature of the ice-water mixture increases slightly. B. the temperature of the ice-water mixture decreases slightly. C. the temperature of the ice-water mixture remains the same. D. The answer depends on the rate at which heat flows.

  8. The Leidenfrost effect

  9. You wish to increase the temperature of a 1.00-kg block of a certain solid substance from 20°C to 25°C. (The block remains solid as its temperature increases.) To calculate the amount of heat required to do this, you need to know A. the specific heat of the substance. B. the molar heat capacity of the substance. C. the heat of fusion of the substance. D. the thermal conductivity of the substance. E. more than one of the above

  10. A pitcher contains 0.50 kg of water at 20°C. You add 0.2 kg of ice at 0°C. What is the final temperature? • 0 oC • Somewhere between 0 and 3.4 oC • Ice water • A and C • Between 3.4 and 20 C

  11. A chair has a wooden seat but metal legs. The chair legs feel colder to the touch than does the seat. Why is this? A. The metal is at a lower temperature than the wood. B. The metal has a higher thermal conductivity than the wood. C. The metal has a lower thermal conductivity than the wood. D. The metal has a lower heat capacity. E. The metal has a higher heat capacity. F. Metal has better radiation.

  12. A17.6 A chair has a wooden seat but metal legs. The chair legs feel colder to the touch than does the seat. Why is this? A. The metal is at a lower temperature than the wood. B. The metal has a higher specific heat than the wood. C. The metal has a lower specific heat than the wood. D. The metal has a higher thermal conductivity than the wood. E. The metal has a lower thermal conductivity than the wood.

  13. Q17.7 When you first step out of a swimming pool on a warm day, you feel cool. This is due primarily to A. conduction. B. convection. C. radiation. D. All three of these are equally important.

  14. A17.7 When you first step out of a swimming pool on a warm day, you feel cool. This is due primarily to A. conduction. B. convection. C. radiation. D. all three of these are equally important.

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