A newly formed planet or large asteroid becomes molten due to
a. the last infalling objects.
b. decay of radioactive element isotopes.
c. the last infalling objects and decay of radioactive element isotopes.
d. none of the other choices as newly formed planets remain solid inside.
c
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Newton's second law focuses on
A) speed. B) velocity. C) acceleration. D) none of the above
A device that measures absolute air pressure is called a
a. manometer b. barometer c. thermometer d. tire gauge e. none of the above
A cup full of water and made of plastic feels warmer than one made of glass because
A. plastic is warmed by water B. plastic conducts heat less than glass C. plastic conducts heat better than glass D. plastic dissolves in water
An atomic mass unit (amu) is 1/12 the mass of
A) an electron. B) a proton. C) a hydrogen atom. D) a carbon atom. E) a uranium atom.