While the historical definition of a constellation is "a pattern or figure of stars in the sky," the modern definition used by astronomers is
A) a group of stars in the sky that are all very close to each other.
B) a specifically named and bordered region of the celestial sphere.
C) any grouping of very bright stars in our galaxy, often hosting a star cluster.
D) no definition; astronomers no longer use the term constellation.
B) a specifically named and bordered region of the celestial sphere.
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The most luminous objects known in the universe are
A) Seyferts. B) quasars. C) blazars. D) radio lobe galaxies. E) giant ellipticals.
As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary. b. greater than the weight of the box. c. equal to the weight of the box. d. less than the weight of the box.
A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at t = 2.0 s?
a. 80 m b. 20 m c. 58 m d. 10 m e. 30 m
For a person with normal vision (near point 25 cm, far point infinity), the maximum angular magnification for a lens is 4.00. If this same lens is used with the relaxed eye, what angular magnification would result?
1.The focal length must be given to figure this out. 2.5.00 3.3.50 4.3.00