A perfect Carnot engine operates between 350 K and 600 K. The engine delivers 10 kJ of work in each cycle. How much heat is extracted from the 600 K reservoir in one cycle?
A)
34 kJ
B)
27 kJ
C)
17 kJ
D)
21 kJ
E)
24 kJ
E
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In the unified model, an accretion disk viewed from the side will cause ____ to be present in the spectrum of a Seyfert galaxy
a. narrow absorption lines b. broad absorption lines c. narrow spectral lines d. broad emission lines e. no absorption lines
Which of the following sound frequencies lie(s) in the audible range?
a. 26 Hz b. 27 kHz c. 1 MHz d. All of these
A 1.50-m long gas column that is open at one end and closed at the other has a fundamental resonant frequency 80.0 Hz. What is the sound speed in this gas?
A) 120 m/s B) 53.3 m/s C) 30.0 m/s D) 213 m/s E) 480 m/s
A few decades ago, there was great controversy among astronomers over the question of quasar distances, with some arguing that quasars are much nearer than application of Hubble's law would seem to imply
Why do nearly all astronomers now agree that quasars really are quite far away? A) We now have images and spectra that show quasars to be embedded at the centers of distant galaxies and within distant galaxy clusters. B) All quasars have large redshifts. C) Now that we can explain bright quasar emission with power due to the presence of supermassive black holes, there is no reason to doubt that quasars are far away. D) No one could think of a way to explain quasar speeds if they are nearby, so we concluded they must be far away.