All real engines are less efficient than the Carnot engine because
a. they do not operate through the Otto cycle.
b. they do not operate through a reversible cycle.
c. the working substance does not maintain a constant volume through the cycle.
d. the working substance does not maintain a constant pressure through the cycle.
e. the working substance does not maintain a constant temperature through the cycle.
b
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The combustion product that is created in the largest amounts by a coal-burning generating plant is
A) acids of sulfur and nitrogen, most of which is filtered out of the exhaust gases and disposed of as solid waste. B) laughing gas, which is why Americans are so silly. C) acids of sulfur and nitrogen, which go up the plant's stack and into the atmosphere. D) carbon dioxide, which goes up the plant's stack and into the atmosphere. E) carbon dioxide, most of which is filtered out of the exhaust gases and disposed of as solid waste.
The K-T event occurred about ______________ million years ago
Fill in the blank(s) with correct word
About how long is the solar cycle (evidenced by the polarity of the Sun's magnetic field)?
A. 3 years B. 22 years C. 5 days D. 11 years
MgO is a high-temperature ceramic material that has mixed ionic and covalent bonding. Should MgO have the NaCl structure or the CsCl structure based upon ionic radii?
What will be an ideal response?