Why are there no small craters on the surface of Venus?
a. The thick atmosphere protects the surface from small meteorites
b. Old surfaces have been subducted by convection currents.
c. Venus formed after the heavy bombardment period.
d. Weathering and erosion removed all craters.
e. Shield volcanoes prevent small craters to remain on exist on the surface.
a
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Wire A and Wire B are each carrying the same current. If the diameter of Wire A is twice that of Wire B, how does the drift velocity vdA in Wire A compare to that in in Wire B?
a. vdA = vdB b. vdA = 2 vdB c. vdA = vdB /2 d. vdA = vdB /4
Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.
The "R-value" of material is not related to its ________
a. composition b. area c. thickness d. resistance to heat flow
What are the differing ages and shapes of the 3 main components?
A: young round bulge, old football disk, young elliptical halo B: young bar-like bulge, young plate disk, old spherical halo C: old round bulge, young frisbee disk, young elliptical halo D: old bar-like bulge, young pancake disk, old spherical halo E: old bar-like bulge, old CD disk, young spherical halo