Which of the following is a vector quantity?
A. volume
B. force
C. speed
D. time
E. length
B. force
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What in a DC motor reverses the polarity and current each half-cycle?
A) a CRT B) solid ring commutator C) a split ring commutator D) fuse
Exhibit 17-1
The figure below shows a sine wave at one point of a string as a function of time.
?
?
Use the exhibit to answer the following question(s).
Refer to Exhibit 17-1. Which of the graphs below shows a wave where the amplitude and the frequency are doubled?
A.
B.
C.
D.
E.
What type of observation can astronomers use to measure the composition of extrasolar planet atmospheres?
A) measurements of the host star's velocity throughout an orbital cycle B) measurement of how frequently the planet blocks the host star's light C) comparisons of spectra when planets are in front of or are eclipsed by their host stars D) combination of a transit observation and a Doppler shift measurement
The emphasis of the orange-and-apple sequence in your text is
A) to define systems. B) that actions equal reactions. C) that forces produce accelerations. D) defining friction as a force. E) that mass is not a force.