Suppose that you are looking at the sky at about midnight on the December solstice. Which star will be nearest to your meridian?
Consider the following data for four stars:
Star RA Dec.
Spica 13hr24m.1 -11°20'
Deneb 20hr39m.7 +45°06'
Sirius 6hr44m.2 -16°42'
Alpha Centauri 14hr38m.4 -60°46'
A) Sirius
B) Alpha Centauri
C) Spica
D) Deneb
A) Sirius
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The critical temperature for nucleosynthesis to begin was the:
A) triple alpha reaction at 100 million K. B) deuterium bottleneck at about 900 million K. C) proton-proton cycle at 10 million K. D) iron production at 10 billion K. E) formation of lithium at 50 million K.
In an engine operating in the Otto cycle, the final volume of the fuel-air mixture is one sixth the initial volume. Assume ? = 1.4 . The maximum theoretical efficiency of this cycle is
a. 17%. b. 49%. c. 51%. d. 56%. e. 83%.
First Law of Thermodynamics: A cylinder contains 13 moles of an ideal gas at a temperature of 300 K. The gas is compressed at constant pressure until the final volume equal 0.70 times the initial volume. The molar heat capacity at constant volume of the gas is 24.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. -28 kJ B. -38 kJ C. 28 kJ D. 38 kJ E. -9.7 kJ
A(n) ______________ transfers heat from a low-temperature reservoir to a high-temperature reservoir
Fill in the blank(s) with correct word