A series of n uncharged concentric shells surround a small central charge q. The charge distributed on the outside of the nth shell is
a. ?nq.
b. ?(ln n)q.
c. +q.
d. +(ln n)q.
e. +nq.
c
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The horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?
A. 35 N B. 30 N C. 40 N D. 45 N E. 25 N
The warmth you feel when you put your hand in a sunbeam is due to which part of the electromagnetic spectrum?
A. X-ray B. ultraviolet waves C. gamma ray D. radio waves E. infrared light waves
If the communication lifetime of civilizations in our galaxy is 100 million years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 1,300,000 B) 1 in 13 C) 1 in 1300 D) 1 in 130
A saber-toothed-tiger's bones contain 1/32 of the amount of 14C that is contained in the bone material of living animals. The half-life of 14C is 6000 years. From this information, we can conclude
A) that the tiger died about [i.e., plus or minus a few thousand years] 42,000 years ago. B) nothing at all, because 14C dating is known to be inaccurate. C) nothing at all, because of the uncertainties associated with radioactive decay. D) that the tiger died about 18,000 years ago. E) that the tiger died about 30,000 years ago.