Three engines operate between reservoirs separated in temperature by 300 K. The reservoir temperatures are as follows:
Engine A: Th 5 1 000 K, Tc 5 700 K
Engine B: Th 5 800 K, Tc 5 500 K
Engine C: Th 5 600 K, Tc 5 300 K
Rank the engines in order of their theoretically possible efficiency, from highest to lowest.
1.A, B, C
2.B, C, A
3.C, B, A
4.C, A, B
[Ques. 2] Identify path D in the figure as isobaric, isothermal, isovolumetric, or adiabatic.
[Ques. 3] Identify path C in the figure as isobaric, isothermal, isovolumetric, or adiabatic.
[Ques. 4] Identify path B in the figure as isobaric, isothermal, isovolumetric, or adiabatic. For path B, Q = 0.
[Ques. 5] Identify path A in the figure as isobaric, isothermal, isovolumetric, or adiabatic.
[Ques. 6] By visual inspection, order the PV diagrams shown in the figure from the most negative work done on the system to the most positive work done on the system.
[Ques. 7] Star A has twice the absolute temperature and twice the radius of star B. What is the ratio of star As power output to star Bs output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1.
1.4
2.8
3.16
4.64
[Ques. 8] Star A has twice the absolute temperature of star B, but they both have the same radius. What is the ratio of star As power output to star Bs output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1.
1.4
2.8
3.16
4.64
[Ques. 9] Stars A and B have the same temperature, but star A has twice the radius of star B. What is the ratio of star As power output to star Bs output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1.
1.4
2.8
3.16
4.64
[Ques. 10] Two rods of the same length and diameter are made from different materials. The rods are to connect two regions of different temperature so that energy will transfer through the rods by heat. They can be connected in series, as in figure a, or in parallel, as in figure b. In which case is the rate of energy transfer by heat larger?
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