If the temperature of the bubble described in problem T7T.8 was 320 K when it formed, what is its approximate final temperature when it reaches the surface?
A. 40 K
B. 80 K
C. 320 K
D. 1280 K
E. 2560 K
F. Other (specify)
B. 80 K
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The making of abundant iron nuclei is typical of
A) planetary nebula ejection. B) the helium flash. C) all novae. D) type I supernovae. E) type II supernovae.
A race car traveling at a constant speed of 50 m/s drives around a circular track that is 500 m in diameter. What is the magnitude of the acceleration of the car?
A) 0 m/s2 B) 1.0 m/s2 C) 10 m/s2 D) 0.63 m/s2 E) 2.2 m/s2
Water falls a distance of 50.0 meters. The specific heat of water is 1.00 cal/gm 
C. What is the increase in temperature of the water after the fall, in 
C?
A. 0.12 B. 1.03 C. 2.65 D. 5.33 E. 7.50
The hot gas of the big bang seems to be cool at about 2.7 K because:
A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang. B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K. C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer. D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.