The most efficient form of locomotion in the animal kingdom is
A) a human walking.
B) a human on a bicycle.
C) a propeller-driven airplane.
D) a bird flying.
E) railroad trains.
B
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How much of Earth’s land surface is still covered with wilderness?
A. 39% B. 49% C. 59% D. 79%
In order for a substance to sustain a fission chain reaction, one important condition is that
A) each fissioning nucleus must release a sufficient number of neutrons. B) the nuclei must collide with enough energy to overcome the electrical repulsion between them. C) each fissioning nucleus must release a sufficient number of alpha-particles. D) energy must be continually supplied from the outside. E) the nuclei must stay in shape by maintaining a regular jogging program.
In which of these v versus t graphs is the acceleration changing?
A. (a)
B. (b)
C. (c)
D. (d)
If the magnitude difference between one star and another is 8, the stars differ in brightness by a factor of
a. 2.51. b. 20. c. 7. d. 1580.