The current shown flowing through each coil must be 
A. increasing.
B. decreasing.
C. remaining constant.
D. One needs more information to say how it is varying.
B. decreasing.
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Doubling the f-number of a camera lens will change the light intensity admitted to the film by what factor?
a. 1/4 c. 1/2 b. 4 d. 2
Which of the following is NOT a vector?
A. Acceleration B. Velocity C. Mass D. Weight E. All of these choices are correct
A person throws three rocks off a cliff of height h at exactly the same speed 
, each time, but throwing rock A almost vertically upward, rock B horizontally, and rock C almost vertically downward (see the diagram below). 
Which rock hits the ground with the greatest speed? (Ignore air friction.) A. Rock A B. Rock B C. Rock C D. Rocks A and C hit with the same speed, faster than B. E. All three rocks hit with the same speed.
All of the following are clusters of galaxies EXCEPT:
A) Andromeda. B) Perseus. C) Coma. D) Virgo. E) Hydra.