In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
B
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Suppose you want to observe and study the radiation from gas inside an interstellar bubble created by a supernova. Which of the following observatories will be most useful?
A) an x-ray telescope in space B) a visible-light telescope on a mountain summit C) an infrared telescope in space D) the Hubble Space Telescope
Carol sees a light bulb turn red, then turn blue. If you are moving near the speed of light past Carol, what do you observe?
A) You also see the light bulb turn red, then blue. B) You observe the light bulb turn blue first, then red. C) You observe the light bulb turn red and blue at the same time. D) What you observe depends on how fast you are moving.
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
A. 7?/3. B. ?/3. C. ?. D. 5?/3. E. 2?.
A reflecting telescope differs from a refracting telescope by using:
a. a concave mirror. b. a convex mirror. c. a system of five converging lenses. d. two converging lenses. e. a single converging lens.