Collisions between galaxies are thought to
A) be commonplace.
B) have stopped about 5 billion years ago.
C) be extremely rare.
D) have never occurred.
E) have only occurred between 10 and 15 billion years ago.
A
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_____ is pulverized rock scattered by meteorite impacts on a planetary surface
A) Ejecta B) A magma ocean C) The Maxwell Montes D) Permafrost
Which one of the following is the correct statement regarding the resistance?
A) The resistance of a conductor decreases with temperature. B) The resistance of a semiconductor increases with temperature. C) The resistance of a wire is directly proportional to the length of the wire. D) All of the above statements are correct. E) None of the above statements is correct.
One practical application of matter waves is
A) the electron microscope. B) photovoltaic cells. C) lasers. D) television. E) X-rays.
A turntable has a moment of inertia of 3.00 × 10^?2 kg·m2 and spins freely on a frictionless bearing at 25.0 rev/min. A 0.600-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.100 m from the center. By what factor does the angular momentum of the system change after the putty is dropped onto the turntable?
a. 1.22 b. 1.00 (no change) c. 0.820 d. 1.20