A string is stretched with a tension of 120 N. The string has a mass of 10.0 grams and has a length of 2.50 meters. The velocity of wave propagation along the string is
A. 125 m/s.
B. 142 m/s.
C. 173 m/s.
D. 185 m/s.
E. 217 m/s.
C. 173 m/s.
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A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
a. 64 N/C b. 133 N/C c. 48 N/C d. 85 N/C e. 34 N/C
Which of the following particles does not mediate the weak interaction?
A. W+
B. W-
C. 
D. Z0
E. All of these choices mediate this interaction.
The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities b. they have spectral lines in different positions c. every element has one unique spectral line d. none of the above
The net force on a moving object suddenly becomes zero. The object then
A. stops abruptly. B. stops during a short time interval. C. changes direction. D. continues at constant velocity. E. slows down gradually.