A cart starts with velocity v and rolls up the frictionless path shown. At what point is the potential energy greatest?
A. 1
B. 2
C. 3
D. 4
D. 4, since the potential energy depends on the position. Highest position—most potential energy.
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Which of the following is NOT a guidelines for optimizing multimedia for efficient web delivery?
A. Include only  high-bandwidth versions. B. Inform the visitor of and provide links to necessary plug-ins. C. Provide options for full-screen viewing of videos or animations. D. Break audio and video files into short segments to create smaller files.
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
A. 16 mV B. 50 mV C. 8.0 mV D. 0.10 mV E. 100 mV
The circuit below contains three 100-watt light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) the brightest?
A. A B. B C. C D. B and C E. All three are equally bright.
Ammonia, NH3, boils at a higher temperature than phosphine, PH3 . This is probably due to
a. ammonia being more dense than PH3. b. ammonia having the lower formula mass. c. hydrogen bonding among the NH3 molecules. d. ammonia being ionic and phosphine being covalent.