How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium.
B) It should orbit the galactic center at a much higher rate of speed.
C) It should be higher in mass.
D) It should be moving very fast relative to the Earth.
A) It should have a higher fraction of elements heavier than hydrogen and helium.
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Neptune has a radius of 2.48 ×107 m and an escape velocity of 23,300 m/s. What is the mass of Neptune? G = 6.67 x 10-11 N•m2/kg2
A) 1.01 × 1026 kg B) 2.02 × 1026 kg C) 3.03 × 1026 kg D) 4.04 × 1026 kg E) 5.05 × 1026 kg
A wire of diameter 0.20 mm stretches by 0.20% when a 6.28-N force is applied to it. What is Young's modulus for this wire?
A) 2.5 × 1010 Pa B) 1.0 × 1011 Pa C) 2.5 × 1012 Pa D) 1.0 ×1012 Pa
Two isotopes that undergo nuclear fission are
A) U-235 and Pu-239. B) Th-238 and U-235. C) all of these D) none of these
While examining the spectrum of a galaxy, you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is
A) moving away from us. B) moving towards us. C) not forming new stars. D) expanding explosively. E) blueshifted.