The Big Bang is regarded as the expansion of
A) space.
B) energy.
C) time.
D) matter.
Answer: A
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PCM thermal storage systems can be used to store thermal energy from solar energy collectors. The solar collector heats water and the hot water is then passed through the PCM for storage. Then, energy is extracted by passing cold water through the tubes to heat that water. For a system using a PCM having a phase change at 95ºF, with cold water at 65ºF passing through the tubes, and with Bi = 30, NTU = 8, and Fr0 = 0.6, determine the outlet water temperature. Assume tubes have a square arrangement with spacing of 2D.
What will be an ideal response?
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He used Cepheid variables in the Andromeda Galaxy. C) He deduced it from its redshift. D) He used white dwarf supernovae in the Andromeda Galaxy.
What objects are sometimes called "failed stars"?
A: NNFOs (No Nuclear Fusion Objects) B: EGGs (Evaporating Gaseous Globules) C: Brown Dwarfs D: Bok Globules E: None of the above
Consider the following statement, and explain whether or not it is sensible: When I looked into the dark fissure of the Milky Way with my binoculars, I saw what must have been a cluster of distant galaxies
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