During which of the following phases of life is a star's pressure and gravity out of equilibrium?
A) main sequence
B) helium core fusion
C) white dwarf
D) red giant
E) A star is never out of equilibrium.
D
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Consider a primed frame that moves in the +x direction with respect to the unprimed frame. Choose from the answers above and to the right to indicate the direction of the electric field in the primed frame.
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. There is no field of this type.
Calcium carbonate is the major component of each of the following except
a. limestone. b. seashells. c. stalagmites. d. bones.
A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is
A) 1/2 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 2/3 m/s. E) 3/2 m/s.
Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?
a. Spitzer Space Telescope b. infrared telescope c. European Southern Observatory d. X-ray telescope e. radio telescope