Sound interference with a pair of radio loudspeakers can be nicely demonstrated when the
A) radio signal is monaural for each.
B) input and output of the speakers are reversed.
C) speakers are brought face to face.
D) all of the above
E) none of the above
Answer: D
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Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.
An air conditioner with a coefficient of performance of 3.5 uses 30 kW of power. How much power is it discharging to the outdoors?
A) 30 kW B) 75 kW C) 105 kW D) 135 kW E) 210 kW
Which of the following planets' average density is closest to that of Earth?
A) Mercury B) Mars C) Venus D) Neptune
The singularity of a black hole
a. is found outside the event horizon. b. is located within the event horizon. c. can only be located if the black hole is in a binary system. d. doesn't exist since all black holes have a finite size.