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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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
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.
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.
Calcium carbonate is the major component of each of the following except
a. limestone. b. seashells. c. stalagmites. d. bones.