Chapter 15: Q20P (page 412)
Question:(I) The exhaust temperature of a heat engine is 230°C. What is the high temperature if the Carnot efficiency is 34%?
Short Answer
The high temperature of the Carnot engine is \(489.12^\circ {\rm{C}}\).
Chapter 15: Q20P (page 412)
Question:(I) The exhaust temperature of a heat engine is 230°C. What is the high temperature if the Carnot efficiency is 34%?
The high temperature of the Carnot engine is \(489.12^\circ {\rm{C}}\).
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Get started for free(II) When\({\bf{5}}{\bf{.80 \times 1}}{{\bf{0}}{\bf{5}}}\;{\bf{J}}\)of heat is added to a gas enclosed in a cylinder fitted with a light frictionless piston maintained at atmospheric pressure, the volume is observed to increase from\({\bf{1}}{\bf{.9}}\;{{\bf{m}}{\bf{3}}}\)to\({\bf{4}}{\bf{.1}}\;{{\bf{m}}{\bf{3}}}\). Calculate
(a) the work done by the gas, and
(b) the change in internal energy of the gas.
(c) Graph this process on a PV diagram.
Question: An ideal air conditioner keeps the temperature inside a room at 21°C when the outside temperature is 32°C. If 4.8 kW of power enters a room through the windows the in form of direct radiation from the Sun, how much electrical power would be saved if the windows were shaded so only 500 W enters?
Question: (I) 1.0 kg of water is heated from 0°C to 100°C. Estimate the change in entropy of the water.
Calculate the work done by an ideal gas while going from state A to state C in Fig. 15–28 for each of the following processes:
(a) ADC,
(b) ABC, and
(c) AC directly.
FIGURE 15–28
Problem 68
(II) An inventor claims to have built an engine that produces 2.00 MW of usable work while taking in 3.00 MW of thermal energy at 425 K, and rejecting 1.00 MW of thermal energy at 215 K. Is there anything fishy about his claim? Explain.
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