Our solar system consists of
A) the Sun and all the objects that orbit it.
B) the Sun and the planets, and nothing else.
C) a few hundred billion stars, bound together by gravity.
D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars.
A
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A refracting telescope has a magnification M. If the focal length of the objective lens is doubled and the eyepiece focal length is halved, what is the new magnification?
A) 4M B) 2M C) M/2 D) M/4 E) M
Three originally uncharged infinite parallel planes are arranged as shown. Then the upper plate has surface charge density ? placed on it while the lower plate receives surface charge density ??. The net charge induced on the center plate is
a.
0.
b.
??/2.
c.
+?/2.
d.
??.
e.
+?.
Vision Problems: Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A. +36.4 cm B. -36.4 cm C. -21.2 cm D. +21.2 cm E. +32.5 cm
Sediments are classified according to the source of their constituents into two main groups. One is chemical. What is the other?
a. Physical b. Clastic c. Detrital d. Inorganic