Stars on the main sequence with the greatest mass
a. are spectral type M stars.
b. are spectral type O stars.
c. are located at the bottom of the main sequence in the H-R diagram.
d. have masses very similar to the Sun.
e. are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.
b
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Which of the following best describes a filtergram?
A) It is a region inside a star where energy is carried outward as rising hot gas. B) It is composed of ionized gas trapped in a magnetic arch rising up through the photosphere. C) It is an atom in which an electron has moved from a lower to a higher energy level. D) It is a photograph taken in the light of a specific region of the spectrum of the Sun.
In the figure, if a = 2.0 cm, b = 4.0 cm, and I = 2.0 A, what is the magnitude of the magnetic field at point P?
A. 49 ?T B. 39 ?T C. 50 ?T D. 69 ?T E. 13 ?T
The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that ________
A) the black hole will eventually suck in the rest of the galaxy B) galaxy formation and supermassive black hole formation must be related somehow C) quasars were more common 10 billion years ago than they are today D) the biggest galaxies have the most luminous quasars
A certain car traveling 34.0 mph skids to a stop in 29 meters from the point where the brakes were applied. In approximately what distance would the car stop had it been going 105.4 mph?
A) 279 meters B) 158 meters C) 90 meters D) 51 meters E) 29 meters