What are comets made of?
A. mostly oxygen and uranium
B. mostly iron, rock, and hydrogen
C. mostly hydrogen and helium
D. mostly ice and frozen gases
E. None of these choices is correct.
Answer: C
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Suppose an astronomer proposed to build a major observatory on the campus of your school. Would it make a good observing site? Explain why or why not
What will be an ideal response?
A baseball batter hits an incoming 45.0-m/s fastball. The ball leaves the bat at 56.0 m/s after a ball-on-bat contact time of 0.040 s. What is the force exerted on the 0.25-kg baseball?
a. 631 N b. 68.8 N c. 350 N d. 16.2 N e. 281 N
Breaks in the geologic record that result from
locally unrecorded intervals of depositing in sedimentary layers are called a)anticlines. b)intrusive sills. c)unconformities. d)warped or folded time.
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of a(n)
a. electroweak theory b. GUT c. quark theory d. generalized theory of relativity e. theory of strangeness