Estimate the surface area of an adult human’s head.
A. 0.05 
B. 0.1
C. 0.05
D. 0.01
A. 0.05
C. 0.05
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A cupful of liquid water placed on the surface of Mars would
A. quickly boil and evaporate. B. rapidly cool but remain liquid. C. expand rapidly and shatter. D. quickly freeze into solid ice.
Electrons are
a. positively charged. b. negatively charged. c. uncharged. d. variably charged.
What doesn't a main sequence star collapse under its own gravity?
A. the energy generated by prominences and flares B. the outward force of gas pressure from its interior C. burning of helium to carbon in the core of the main sequence star D. the degeneracy pressure from neutrons resists collapse E. burning of iron in the core of the main sequence star
According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of
A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above