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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 11 | Consider two different rods. The greatest thermal conductivity will be in the rod with: | electrons that are free to move from atom to atom. | |
| 11 | 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? | 3.0 | |
| 11 | Find the final equilibrium temperature when 10.0 g of milk at 10.0°C is added to 160 g of coffee at 90.0°C. (Assume the specific heats of coffee and milk are the same as water and neglect the heat capacity of the container.) cwater = 1.00 cal/g·ºC = 4186 J/kg·ºC | 85.3°C | |
| 11 | Heat flow occurs between two bodies in thermal contact when they differ in what property? | temperature | |
| 11 | How does the heat energy from the sun reach us through the vacuum of space? | radiation | |
| 11 | How many calories are equal to one BTU? (One calorie = 4.186 J, one BTU = 1 054 J.) | 252 | |
| 11 | How much heat energy is required to vaporize a 1.0-g ice cube at 0°C? The heat of fusion of ice is 80 cal/g. The heat of vaporization of water is 540 cal/g, and cwater = 1.00 cal/g×°C. | 720 cal | |
| 11 | How much heat energy must be removed from 100 g of oxygen at 22°C to liquefy it at -183°C? (The specific heat of oxygen gas is 0.218 cal/g×°C, and its heat of vaporization is 50.9 cal/g.) | 9560 cal | |
| 11 | I place a 500-g ice cube (initially at 0°C) in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2 . If the air surrounding the box is at 20°C and after 4 hours the ice is completely melted, what is the conductivity of the Styrofoam material? (Lf = 80 cal/g) | 2.3*10^-4 cal/s*cm*°C | |
| 11 | I take 1.0 kg of ice and dump it into 1.0 kg of water and, when equilibrium is reached, I have 2.0 kg of ice at 0°C. The water was originally at 0°C. The specific heat of water = 1.00 kcal/kg*°C, the specific heat of ice = 0.50 kcal/kg*°C, and the latent heat of fusion of water is 80 kcal/kg. The original temperature of the ice was: | -160°C | |
| 11 | Iced tea is made by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kg of ice, initially at 0°C, are required to bring the mixture to 10°C? (Lf = 3.33*10^5 J/kg, cw = 4186 J/kg×°C) | 1.4 kg | |
| 11 | If a 1000-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J) | 1.1*10^5 | |
| 11 | If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food? 1) increase pan bottom thickness 2) increase pan bottom area 3) increase burner temperature 4) decrease height of pan sides 5) both choices A and D are valid. | increase pan bottom thickness | |
| 11 | If heat is flowing from a table to a block of ice moving across the table, which of the following must be true? | the ice is cooler than the table. | |
| 11 | 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? | radiation |
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