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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 |
|---|---|---|---|
| 12 | Area on a P-V diagram has units associated with: | energy. | |
| 12 | As the ideal gas expands from pressure P1 and volume V1 to pressure P2 and volume V2 along the indicated straight line, it is possible that: 1) the temperature stays constant. 2) the internal energy decreases. 3) the gas is changing state. 4) all of the above are impossible for this particular graph. 5) both choices B and C are valid. | 4) all of the above are impossible for this particular graph. | |
| 12 | During an isobaric process which one of the following does not change? 1) volume 2) temperature 3) internal energy 4) pressure 5) both choices C and D are valid. | pressure | |
| 12 | During each cycle of operation a refrigerator absorbs 55 cal from the freezer compartment and expels 85 cal to the room. If one cycle occurs every 10 s, how many minutes will it take to freeze 500 g of water, initially at 0°C? (Lv = 80 cal/g) | 120 min | |
| 12 | Entropy is a measure of the ____ of a system. | disorder | |
| 12 | Heat is applied to an ice-water mixture to melt some of the ice. In this process: | The internal energy increases. | |
| 12 | If a heat engine has an efficiency of 30% and its power output is 600 W, what is the rate of heat input from the combustion phase? | 2000 W | |
| 12 | If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas: 1) temperature increases. 2) volume increases. 3) pressure increases. 4) internal energy decreases. 5) both choices B and C are valid. | volume increases. | |
| 12 | If one could observe the individual atoms making up a piece of matter and note that during a process of change their motion somehow became more orderly, then one may assume which of the following in regard to the system? 1) increases in entropy 2) decreases in entropy 3) gains in thermal energy 4) positive work done on 5) decrease in thermal energy | decreases in entropy | |
| 12 | In an isobaric process 4.5*10^4 J of work is done on a quantity of gas while its volume changes from 2.6 m3 to 1.1 m3. What is the pressure during this process? | 3.0*10^4 Pa | |
| 12 | In an isothermal process for an ideal gas system (where the internal energy doesn't change), which of the following choices best corresponds to the value of the work done on the system? 1) its heat intake 2) twice its heat intake 3) the negative of its heat intake 4) twice the negative of its heat intake 5) none of the above | the negative of its heat intake | |
| 12 | In an isovolumetric process by an ideal gas, the system's heat gain is equivalent to a change in: 1) temperature. 2) volume. 3) pressure. 4) internal energy. 5) none of the above. | internal energy. | |
| 12 | In which system is heat usually transferred from the cooler part to the warmer part? 1) a stove as it heats up water 2) a refrigerator that is running 3) an electric fan that is running 4) none of the above, because it is impossible to transfer heat in this manner 5) both choices B and C are valid. | a refrigerator that is running | |
| 12 | Of the following heat engines, which has the highest efficiency? 1) Hero's engine 2) a Carnot engine 3) a car's gasoline engine 4) a truck's diesel engine 5) a steam engine | A Carnot engine | |
| 12 | On a P-V diagram, an ____ process is represented by a horizontal line. 1) isobaric 2) isothermal 3) isovolumetric 4) adiabatic 5) none of the above | isobaric |
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