The totally eclipsed Moon glows coppery red because sunlight reaches the Moon's surface after passing through Earth's atmosphere
a. True
b. False
Indicate whether the statement is true or false
True
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Design a heat pipe cooling system for a spherical satellite that dissipates 5000 W/m3 , has a surface area of 5 m2 , and cannot exceed a temperature of 120°C. All the heat must be dissipated by radiation into space. State all your assumptions.
GIVEN
FIND
(a) A design for a heat pipe cooling system
ASSUMPTIONS
? Temperature drop between the satellite interior and the heat pipe evaporator is < 20°C
? Neglect vapor pressure drop in the heat pipe
Suppose you are using the Doppler method to look for planets around another star. What must you do?
A) Compare many spectra of the star taken over a period of many months or years. B) Compare many spectra of an orbiting planet taken over a period of many months or years. C) Compare the brightness of the star over a period of many months or years. D) Carefully examine a single spectrum of an orbiting planet. E) Carefully examine a single spectrum of the star.
How many quark flavors are there?
a. 1 b. 3 c. 6 d. none of the above
A method of expressing the accuracy of measured quantities is
a. metric prefixes. b. derived units. c. significant figures. d. conversion factors.