Why does a star grow larger in radius immediately after it exhausts its core hydrogen?
A) The outer layers of the star are no longer gravitationally attracted to the core.
B) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
C) Helium fusion in the core generates enough thermal pressure to push the upper layers outward.
D) Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
B) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
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Evidence that supports quasars being the nuclei of very distant galaxies includes
a. the existence of quasar fuzz. b. the observation of a supernova near a quasar whose distance from its brightness is consistent with the large redshift. c. gravitational lensing of some quasars by nearby galaxies. d. all of the above e. none of the above
When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure
A) halves. B) doubles. C) quadruples. D) remains the same.
Pitch is related to what physical characteristic of a wave?
A. Wavelength B. Speed C. Frequency D. Amplitude
A brass rod, 4.0 m long and with a cross sectional area of 9.2 × 10-6 m2 is subjected to a tension of 6.0 × 103 N/m2
The Young's modulus for brass is 9.0 × 1010 N/m2, and the Poisson ratio is 0.48. By how much does the volume of the rod change? A) 6.3 × 10-7 m3 B) 0.029 m3 C) 2.7 × 10-7 m3 D) 4.0 × 10-7 m3 E) 5.2 × 10-7 m3