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.

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

Which of these has a higher frequency than visible light?

A) radio wave B) microwave C) infrared wave D) ultraviolet wave E) all do

Physics & Space Science

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

Physics & Space Science