Which of these are units of measure?
a. time
b. energy
c. seconds
d. kilometers
e. volume
C, D
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A pendulum makes 12 complete swings in 8.0 s
(a) What is its frequency? (b) What is its period?
The Flash, a comic superhero, is able to run close to the speed of light. Two people, with synchronized watches, stand several kilometers apart and time the Flash as he runs a straight course. The Flash has his own stopwatch and uses it to independently time his run. The Flash also observes the speed at which the finish line moves toward him, and upon finishing his run he calculates the length of the course by multiplying this speed by the time on his stopwatch. Who measures (I) the Flash's proper time for the race, and who measures (II) the rest or proper length for the race?
A. Both the Flash and the two people measure (I) and (II) B. Only the Flash measures both (I) and (II) C. The two people measure (I) and Flash measures (II) D. Neither the Flash nor the two people measure (I) or (II) E. The Flash measures (I) but the two people measure (II)
In the spectrum of white light which one of the following colors corresponds to the highest temperature?
A) Yellow B) Violet C) Green D) Red E) Orange
The high voltage that is important in a power line is high voltage
A) between the parallel wires of the line. B) from one end of each power line to the other. C) both of these D) neither of these