The mass density of normal air is, at a particular temperature,
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
A. 
B. 
C. 
D. 
E. 
F. 
A.
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Why is the Coriolis effect so weak on Venus?
A) because Venus is so hot B) because Venus rotates so slowly C) because Venus has such a thick atmosphere D) because Venus has such a strong greenhouse effect
A length of wire has resistance R. The same kind of wire twice as long has resistance
A) R/2. B) R. C) 2R. D) none of the above
Consider the situation below. Object A is a metal sphere with zero net charge, and objects B and C are particles with the same negative charge. Which choice shown to the right best indicates the direction of the electric field at point P? (If you are using the letters on the back cover to indicate your answer, you can indicate the double-letter choices by pointing to a letter with two fingers.)
A. A
B. B
C. C
D. D
E. Zero
F. AA
G. BB
H. CC
I. DD
In what sense is all observable deuterium "primordial"? Why is its abundance so important in cosmology?
What will be an ideal response?