Which of these would be made up of only Population II stars?
A) Seyfert spirals
B) Irr type II
C) elliptical galaxies
D) barred spirals
E) Irr type I
C
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How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
Organisms that can survive at very low temperatures are referred to as
A) frostophiles B) freezophiles C) hypothermaphiles D) psychrophiles
A frictionless simple pendulum, with a small but dense 4.4-kg bob at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical
(a) To what height above its lowest point does the bob swing on the other side? (b) What is the speed of the bob at the bottom of the swing?
Consider two copper wires. One has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The thicker wire has half the resistance of the shorter wire. C) The thicker wire has twice the resistance of the shorter wire. D) none of the given answers