Where does most star formation occur in the Milky Way today?
A) in the halo
B) in the bulge
C) in the spiral arms
D) in the Galactic center
E) uniformly throughout the Galaxy
C
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Aberration: Which of the following statements are correct? (There could be more than one correct choice.)
A. Spherical aberration, but not chromatic aberration, occurs for lenses. B. Chromatic aberration, but not spherical aberration, occurs for lenses. C. Both chromatic aberration and spherical aberration occur for lenses. D. Both chromatic aberration and spherical aberration occur for spherical mirrors.
A longitudinal wave is represented by the equation z(z, t) = -2.0 cm sin(1,200 rad/s t - 20 
z). Another longitudinal wave is represented by the equation z(z, t) = +2.0 cm sin(1,200 rad/s t + 20
z). What is the equation that represents the superposition of the two waves?
A. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20
z)
B. z(z, t) = +4.0 cm cos(1,200 rad/s t) sin(20z)
C. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20z)
D. z(z, t) = -2.0 cm cos(1,200 rad/s t) sin(20z)
A force of 1 N accelerates 1-kg box at the rate of 1 m/s2. The acceleration of a 2-kg box by a net force of 2 N is
A) half as much. B) twice as much. C) the same. D) none of the above
The appearance of the great range of brightness among stars is due to
A) the differences in the amount of light different stars emit. B) the differences in the distances of stars from us. C) both of the given answers D) none of the given answers