________ is the study of the universe, including its properties, structure, and evolution
Fill in the blank(s) with the appropriate word(s)
Answer: Cosmology
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The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
a. 0 b. 0.25 c. 0.50 d. 0.79 e. 1.0
What makes a reference system "inertial"?
a. Newton's first law applies in that system. b. Newton's second law applies in that system. c. Newton's third law applies in that system. d. Velocities add according to the rules of vector addition in that system. e. Newton's law of gravitation applies in that system.
Classical Greek astronomers believed the motions of the heavens could be described by uniform circular motion
Indicate whether the statement is true or false
What is an emission nebula?
A. a region of ionized gas around hot O or B type stars B. a region of gas around cool K or M type stars C. a gas cloud in globular clusters D. a region of gas around black holes