Which of the following luminosity classes refers to stars on the main sequence?
A) I
B) II
C) III
D) IV
E) V
E
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The Moon and Mercury can be eliminated as hosts for life because:
A) they do not have an atmosphere and water would boil away into space. B) they have water in the form of ice. C) they only have traces of water vapor in their atmospheres. D) they do not have solid surfaces.
For a point mass equal to that of the Sun, how far does the Schwarzschild radius extend from its center?
a. A few kilometers away b. A few solar radii away c. A few astronomical units (AU) away d. A few parsecs away
Consider the cooling of (a) a personal computer with a separate CPU, and (b) a laptop computer. The reliable functioning of these machines depends upon their effective cooling. Identify and briefly explain all modes of heat transfer that are involved in the cooling process.
GIVEN - A personal computer with a separate CPU (the monitor, keyboard, and mouse are separate and not considered). - A laptop computer. FIND Identify and describe modes of heat transfer involved in their cooling. ASSUMPTIONS - The computers are turned on and in normal operation.
An unpolarized beam of light is incident on a pane of glass (n = 1.69) such that the reflected component coming off the glass is completely polarized. What is the angle of incidence in this case?
a. 53.7° b. 7.33° c. 1.04° d. 59.4° e. 36.3°