The velocity of longitudinal waves in a long brass rod is 3,260 m/s. If the density of brass is 8,470 
then what is the tensile modulus of brass?
A. 
B. 
C. 
D. 
E. 
B.
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Star clusters are important to our study of stars because
a. all stars formed in star clusters. b. the Sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. All of the other choices are correct.
Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
A) is brought to a rapid halt. B) decelerates gradually to a halt. C) continues at the speed it had when it encountered the second force. D) theoretically tends to accelerate toward the speed of light. E) none of the above
Which of these has a higher frequency than visible light?
A) radio wave B) microwave C) infrared wave D) ultraviolet wave E) all do
Which of the following statements is incorrect?
a. Capacitance is always positive. b. The symbol for potential difference between the plates of a capacitor is . c. Water is a polar molecule. d. When a dielectric is placed in a capacitor it serves to reduce the electric field. e. Nonpolar molecules cannot be used for dielectric material in a capacitor.