A star on the upper edge of the main sequence denotes that:
A) it has exhausted nearly all hydrogen in its center.
B) it has reached stability for the first time.
C) it is in the zero-age main sequence.
D) it is converted into a brown dwarf.
A
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The centers of granules
a. are hot material rising to the photosphere from below. b. are cool material falling from the photosphere to the regions below. c. are fainter and hotter than their surroundings. d. are brighter and cooler than their surroundings. e. show strong Zeeman effects.
The Gateway Arch in St. Louis, Missouri, is a
A) parabola. B) hyberbola. C) catenary.
The rigid object shown is rotated about an axis perpendicular to the paper and through point P. The total kinetic energy of the object as it rotates is equal to 1.4 J. If M = 1.3 kg and L = 0.50 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles.
A. 1.3 rad/s B. 1.5 rad/s C. 1.7 rad/s D. 1.2 rad/s E. 2.1 rad/s
Our sun will conclude its life as
A) a white dwarf. B) a black hole. C) a neutron star. D) a red giant. E) a daffodil.