If Fig. 39.2 represents a planet with the same period as Earth, how long does it take for the planet to move from one dot to the next?
Time = 365 days/18 dots = 20.3 days.
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If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
a. 24.5 N b. 49.0 N c. 69.3 N d. 98.0 N e. 139 N
The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site was found to produce 20 counts per minute from a given sample, whereas the same amount of carbon from a piece of living wood produced 160
counts per minute. The half-life of carbon-14, a beta emitter, is 5730 years. Thus we would estimate the age of the artifact to be about A) 5,700 years. B) 11,500 years. C) 14,800 years. D) 17,200 years. E) 23,000 years.
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m. b. 170 m. c. 340 m. d. 680 m. e. none of the above.
What effect does the formation of sea ice in polar regions have on the density of seawater?
What will be an ideal response?