Can work be done on a system if there is no motion?
A) Yes, since motion is only relative.
B) Yes, if the sum of the external forces is zero.
C) Yes, if an external force is acting on the system.
D) No, since a system which is not moving has no energy.
E) No, since work involves a non-zero displacement.
E
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Which of the following observatories is most likely to discover a black hole in a binary system?
A) the Hubble Space Telescope B) the Chandra X-Ray Observatory C) the SOFIA airborne infrared observatory D) the Arecibo Radio Observatory
When using an eyepiece of focal length f, the Yerkes refracting telescope gives a magnification of 800 . What focal length eyepiece would yield a magnification of 500?
a. (8/5)2f b. (5/8)f c. (8/5)f d. (5/8)2f
When unpolarized light from air (with refractive index 1.00 ) strikes a piece of glass with index of refraction 1.80,
the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle ? above the floor. d. pushed by a force directed at an angle ? into the floor. e. turned on its side and pushed by a force parallel to the floor.