______________ is the point in Earth's orbit where Earth is closest to the sun
a. Aphelion
b. Perihelion
c. Precession
d. The winter solstice
e. a and d
B
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As a supersonic aircraft increases in speed, the angle of its V-shaped shock wave becomes
A) wider. B) narrower. C) both of these D) neither of these
You are conducting an experiment with a converging lens and have set it up to produce a real image of a tree in the distance. You then cover the top half of the lens with opaque paper. What occurs?
A. The bottom half of the image is missing B. Nothing happens C. The image becomes half as large D. The image is complete, but dimmer than it was E. The top half of the image is missing
Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual e. both c and d
How is it that Earth has less CO2 in its atmosphere than Venus, even though both planets likely outgassed the about the same amount of CO2 during their development? a. Earth absorbed most of the CO2 into its oceans
b. Venus absorbed most of the CO2 into its oceans. c. Earth lost most of its CO2 because of weak gravity. d. Venus rotates too slowly to lose any of its CO2. e. Venus retained much of its CO2 in polar ice.