On Earth the starting point of longitude is Greenwich, England. On the celestial sphere, what is the starting point of the right ascension?
Autumnal Equinox
Vernal Equinox
Summer solstice
Winter solstice
Vernal Equinox
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An electric car runs off a battery which drives the front wheels. The car’s rear wheels drive a generator which recharges the battery.
A. first kind B. second kind
In a fission bomb explosion, how many neutrons [on the average] created during the fission of a 235U nucleus cause further fission in other uranium nuclei?
A) None B) Less than one C) More than one D) One E) Ten
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?
During the Mesozoic, the supercontinent of Laurasia fragmented into the continents of
A) North America, Europe, and Asia. B) South America, Africa, Antarctica/Australia, and India/Madagascar. C) North America, Europe, and Africa. D) South America, Australia, and Antarctica.