The formation of the early Appalachian Mountains began as a result of tectonic activity during the
A) Paleozoic era.
B) Triassic era.
C) Mesozoic era.
D) Cenozoic era.
Answer: A
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Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
A) The red star is more massive than the blue star. B) The blue star is more massive than the red star. C) The red star is farther away than the blue star. D) The blue star has a hotter surface temperature than the red star. E) The red star has a hotter surface temperature than the blue star.
Based on the given right ascensions and declinations, which of the following stars lies closest to the celestial equator on the celestial sphere?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case?
The diameter of this wire is 1.6 mm. Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C. A) 5.51 × 10-4 m/s B) 4.56 × 10-4 m/s C) 1.65 × 10-3 m/s D) 4.44 × 10-2 m/s E) 4.89 × 10-5 m/s
Which answer below is not a statement of the second law of thermodynamics?
a. Real processes proceed in a preferred direction. b. Energy does not flow spontaneously by heat from a cold to a hot reservoir. c. The entropy of the universe increases in all natural processes. d. In theory, heat engines working in a cycle employ reversible processes. e. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.