Physics, 02.08.2019 18:30 kingdede8811
Which of the following statements is a logical consequence of the second law of thermodynamics?
a) if the entropy of a system increases, there must be a corresponding decrease in the entropy of the universe.
b) if there is an increase in the energy of a system, there must be a corresponding decrease in the energy of the rest of the universe.
c) every energy transfer requires activation energy from the environment.
d) every chemical reaction must increase the total entropy of the universe.
e) energy can be transferred or transformed, but it cannot be created or destroyed.
Answers: 3
Physics, 21.06.2019 17:00
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Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?
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Physics, 22.06.2019 02:30
Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference
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Physics, 22.06.2019 17:30
Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.
Answers: 3
Which of the following statements is a logical consequence of the second law of thermodynamics?
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