Which law of thermodynamics states that no system can reach absolute zero?
A) First law
B) Second law
C) Third law
D) all of the above
Answer: C
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A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The impedance is
a. 4.68 ?. b. 8.84 ?. c. 10.0 ?. d. 13.4 ?. e. 18.8 ?.
A planet is most likely to have volcanic and tectonic activity if it has
A) low surface gravity. B) high surface gravity. C) low internal temperature. D) high internal temperature. E) a dense atmosphere.
One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C,
the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J) (a) What is the actual efficiency of this engine? (b) What is the power output of this engine? (c) What would be the maximum possible efficiency for an engine using the same temperature extremes?
Free _________grades of copper have 1 to 6 weight percent lead.
Fill in the blank(s) with the appropriate word(s).