Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor b. ozone
c. CFCs d. methane
a
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A soap film is being viewed in white light. As the film becomes very much thinner than the wavelength of blue light, the film
A) appears black because it reflects no visible light. B) appears blue since all other colors are transmitted. C) appears white because it reflects all wavelengths of visible light. D) appears red since all other colors are transmitted.
If we learn that F = G mM/d2 where the units are F:Newtons, m:kg, M:kg, and d:meters; what are the units of G?
What will be an ideal response?
The ratio M/m of the prefixes M and m has what value?
a. 103 c. 109 b. 106 d. 1018
Which of the following frames would be an appropriate inertial reference frame for analyzing the effects on the earth of its gravitational interaction with the moon? In each case, answer A if the frame is appropriate, or B if it would be bad for this purpose. Except for the first case, assume the frames are nonrotating.
(a) A frame attached to the earth’s surface (b) A frame attached to the earth’s center of mass (CM) (c) A frame attached to the earth–moon system’s CM (d) A frame attached to the sun’s CM (e) A frame attached to the entire solar system’s CM