The lunar maria are
a. the lava plains of the lunar lowlands.
b. the smooth plateaus of the lunar highlands.
c. less than one billion years old.
d. moving plates of lunar crust.
e. older than the lunar highlands.
A
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Asteroid 433 Eros is one of the largest near-Earth asteroids. For purposes of this problem, assume it is spherical. The value of g at its surface is 0.00600 m/s2 and the escape velocity is only 9.95 m/s. What is the radius of Eros?
A) 8250 m B) 16,000 m C) 1600 m D) 800 m E) 400 m
The objective lens of a high-power microscope will have a ________ (large, short) focal length and will be a ________ (converging, diverging) lens.
Fill in the blank(s) with the appropriate word(s).
A bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling. Assuming there is no friction and the bottom of the hill is 20 meters below the top, what is the bicyclist's speed at the bottom of the hill?
A lump of energy associated with light is called a
A) quantum. B) photon. C) both of these D) neither of these