Comparison of the number of sunspots and the surface temperature of Earth shows a correspondence right up to the present day.
Answer the following statement true (T) or false (F)
False
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Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
A. 0.25. B. 0.50. C. 1.0. D. 2.0. E. 4.0.
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?
Consider the following statement, and explain whether or not it is sensible: It will take me light-years to complete this homework assignment
What will be an ideal response?
Chemically, helium is
A) an isotope. B) an element. C) a mixture. D) a solid. E) a compound.