A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 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) What is the Carnot efficiency?
(a) 33%
(b) 46%
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Suppose you want to determine the chemical composition of a distant planet or star. Which of the following will be most useful to have?
A) high angular resolution B) high turbulence C) a radio telescope D) high spectral resolution
What advantage do radio astronomers have over optical ones in mapping the entire Milky Way?
What will be an ideal response?
What were the major reasons for the great increase in size of the typical power plant as seen in Fig. 8.10?
What will be an ideal response?
A massive star can fuse only up to the element silicon in its core
Indicate whether the statement is true or false