For the Doppler effect to occur, there must be
a. a moving source.
b. a moving observer.
c. relative motion between a source and an observer.
d. no motion.
c
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A steel bracket ABCD (EI 5 4.2 3 106 N # m2), with span length L 5 4.5 m and dimension a 5 2 m, is subjected to load P 5 10 kN at D. The maximum deflection at B is approximately:
(A) 10 mm
(B) 14 mm
(C) 19 mm
(D) 24 mm
A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor and a 200-? resistor. What is the rms value of the current in this circuit?
A) 1.5 A B) 0.48 A C) 2.5 A D) 3.5 A E) 0.59 A
Which of the following can change the frequency of a wave?
a. interference b. the Doppler effect c. diffraction d. all of the above
Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it. B) It plays a crucial role in nuclear fusion in the Sun. C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers. D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.