If y = 0.02 sin (30x - 400t) (SI units), the wave number is
a. 30 rad/m
b. 30/2p rad/m
c. 400/2p rad/m
d. 400 rad/m
e. 60p rad/m
A
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A. A B. B C. C D. A and B E. A and C
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Which of the following statements best explains why all the planets orbit the Sun in the same direction and in nearly the same plane?
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