Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size.
B) be moving away from us, with more distant ones moving faster.
C) be made mostly of dark matter.
D) rotate rapidly.
B) be moving away from us, with more distant ones moving faster.
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A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy
Fill in the blank(s) with correct word
What are Kepler's three laws?
What will be an ideal response?
Atmospheric pressure decreases as one moves to higher elevations because
A. it is much colder on a mountain than at sea level. B. there is much less air above a mountain than above the oceans. C. the air moves at higher speeds near mountains than over the oceans. D. the force of gravity is weaker on a mountain than at sea level.
What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
a. The fact that heat naturally moves from cooler regions to hotter ones. b. The addition of mechanical work to the system. c. The chance occurrences of heat flow from cooler to hotter systems. d. The use of electricity, not heat. e. The fact that no energy is wasted as heat in this kind of system.