A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be
A) equal to the weight of the bucket.
B) greater than the weight of the bucket.
C) less than the weight of the bucket.
A
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Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential energy from most positive to most negative when traveling from A to B.
A. I = II = III = IV. B. II = III > I > IV. C. III > I = IV > II. D. II > I = IV > III. E. I > II = III > IV.
Suppose you live at latitude 20°N. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
Which fundamental fact about the electromagnetic force explains why electromagnetic waves exist, rather than simply electromagnetic force?
A) The electromagnetic force acts at a distance with a delay time, rather than instantaneously. B) The electromagnetic force decreases at points more distant from the source of that force. C) The electromagnetic force can be felt in all directions from the source of that force. D) The electromagnetic force cannot be felt across vacuum. E) The electromagnetic force acts instantaneously at a distance, with no delay time.
A tennis ball is held above and in contact with a basketball, and then both are simultaneously dropped. The tennis ball bounces off the basketball at a fairly high speed. This is because:
a. the basketball falls farther than the tennis ball. b. the tennis ball is slightly shielded from the Earth's gravitational pull. c. the massive basketball transfers momentum to the lighter tennis ball. d. the tennis ball has a smaller radius.