A galaxy that has gone through many collisions and mergers must be a(n) _______________ galaxy
Fill in the blank(s) with correct word
elliptical
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An observer's nadir is
a. the point directly opposite the observer's zenith. b. the north point on the observer's horizon. c. located at the center of Earth. d. always located near a circumpolar constellation. e. directly opposite the north celestial pole.
Kinetic Energy: A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
A. 2.0 J B. 1.0 J C. 0.50 J D. 0.25 J E. 4.0 J
If a barbell weighs 10 pounds on the Moon, what would it weigh on Earth?
A. 30 pounds. Surface gravity on Earth is 3 times that on the Moon. B. 10 pounds. Gravity is the same on Earth and the Moon. C. 60 pounds. Surface gravity on Earth is 6 times that on the Moon. D. 1.67 pounds. Surface gravity on the Moon is 1/6 that on Earth.
Which of the following statements about nuclear fusion is not true?
A. It involves two or more small atomic nuclei slamming into each other and sticking together to make a larger atomic nucleus. B. It refers solely to the process of converting hydrogen into helium. C. It is the process that has made most of the elements of which we and the Earth are made. D. It is the process that generates the energy by which our Sun shines.