Which of the following best describes the findings of the Viking landers in the experiments they conducted to search for life on Mars?
A) Some experiments were potentially suggestive of life, but their results could also be explained by chemical reactions not associated with life.
B) Absolutely no evidence indicating life was found in the Martian soil.
C) The landers detected organic material and evidence for microbial organisms in the soil.
D) The experiments failed to operate properly and therefore did not provide any results.
A) Some experiments were potentially suggestive of life, but their results could also be explained by chemical reactions not associated with life.
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Which are the two planets without a moon?
a. Mercury and Venus b. Venus and Mars c. Mars and Uranus d. Uranus and Neptune
For a gas of N identical molecules of molecular volume Vm in total volume V at temperature T, the number of ways of locating the N molecules in the volume is
A.
.B.
.C.
.D.
.E.
.Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm B) 20 N/m C) 200 N/m D) 2000 N/cm E) 0.0020 N/m