Figure OQ31.2 is a graph of the magnetic flux through a certain coil of wire as a function of time during an interval while the radius of the coil is increased, the coil is rotated through 1.5 revolutions, and the external source of the magnetic field is turned off, in that order. Rank the emf induced in the coil at the instants marked A through E from the largest positive value to the
largest-magnitude negative value. In your ranking, note any cases of equality and also any instants when the emf is zero.
4
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The population of the United States is approximately 290,000,000. Write this in scientific notation.
a. 
b. 
c. 
d. 
A 100 lb sack of potatoes falls from an airplane. As the velocity of fall increases, the air resistance also increases. When air resistance equals 100 lb, the acceleration of the sack will be ____ m/sec/sec
a. 0 b. 16 c. 32 d. 9.8 e. 24
A disturbance in particle motion parallel to the wave velocity is called a
a. transverse wave. b. acoustic wave. c. standing wave. d. longitudinal wave.
Why is Newton's version of Kepler's third law so useful to astronomers?
A) It allows us to calculate distances to distant objects. B) It can be used to determine the masses of many distant objects. C) It tells us that more-distant planets orbit the Sun more slowly. D) It explains why objects spin faster when they shrink in size.