Most stars in the Milky Way probably formed
A) alone.
B) in intergalactic space, then were swept up into the Galaxy.
C) in clusters in the Galaxy's spiral arms.
D) from planetary nebulae.
E) in the galactic Nucleus, then migrated outward later.
C
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An ideal spring with a spring constant of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A) 0.0068 J B) 0.012 J C) 0.024 J D) 0.030 J
What are the functions of the objective lens in the refracting telescope?
Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field B. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.The frequency of a generated electromagnetic wave matches the
A) field strength of the fields. B) energy of the fields. C) frequency of vibrating charges that produced it. D) frequency of domains in the magnetic part of the wave.