During a severe thunderstorm, it is advisable to
a. seek shelter under a tree.
b. do laundry or watch TV.
c. call someone on the phone.
d. do none of these things.
d
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Which of the following are predictions of inflation theories?
A. The cosmic microwave background must be uniform. B. The Universe expanded rapidly over a short period of time. C. The smaller initial size of the Universe allowed thorough mixing. D. All of these choices are correct.
Electrons flow in an electrical circuit by
A) being bumped by other electrons. B) colliding with molecules. C) interacting with an established electric field. D) none of the above
How much work is done by 3.00 mol of ideal gas when it triples its volume at a constant temperature of 127°C? The ideal gas constant is R = 8.314 J/mol ? K
A) 12.7 kJ B) 9.97 kJ C) 11.0 kJ D) 15.3 kJ E) 1.20 kJ
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 mCi. How many curies (in mCi) were initially prepared?
a. .60 b. .70 c. .65 d. .55 e. .39