A heavy rock and a light rock in free fall have the same acceleration because the
A) force due to gravity is the same on each.
B) air resistance is always zero in free fall.
C) inertia of each is the same.
D) ratio of force to mass is the same.
E) none of the above
Answer: D
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An object weighs 432 N on the surface of the earth. The earth has radius R. If the object is raised to a height of 3R above the earth's surface, what is its weight?
A) 108 N B) 48.0 N C) 27.0 N D) 305 N E) 144 N
The halo in the spherical component of the Milky Way contains about _____ as many stars as the disk of the galaxy
A) 2 percent B) 6 percent C) 10 percent D) 14 percent
The main lens or mirror of a telescope is called the ____________________
Fill in the blank(s) with correct word
The Sun's photosphere is, by mass, about 75%
a. helium. b. carbon. c. hydrogen. d. oxygen.