The L = 4 orbital number admits how many "orientations" of the orbital angular momentum vector?
A) 8
B) 1
C) 5
D) 4
E) 9
E
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists. B) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. C) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. D) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit.
A cross-flow heat exchanger is used to heat mixed air from 20 ºC to 45ºC. Water at 75ºC enters the tube and leaves at 45ºC. If the overall heat transfer coefficient is 50 W/m^2?ºC and there is to be 30,000 W of heat exchanged, determine the necessary heat exchanger surface area and the mass flow of water.
What will be an ideal response?
Where can you find a midocean rise?
a. Mediterranean Sea b. Pacific Ocean c. Arctic Ocean d. Red Sea e. Indian Ocean
General Questions: You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.
A. True B. False