A quark is
A)
a constituent of a nucleon.
B)
a constituent of a hadron.
C)
an elementary particle.
D)
all of the given answers.
D
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The planet COROT-14b is only slightly larger than Jupiter, but is several times as massive. Which is the most plausible explanation for its similar size to Jupiter?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity to a higher density than Jupiter.
A cola drink is a good example of
a. a compound. b. a heterogeneous mixture. c. a homogeneous mixture. d. an element.
For microbes to survive the journey in a meteorite from another solar system body to the Earth they would have to survive the
A) impact that blasted the rock off of the surface of its home world B) high energy particles and radiation in space C) entry through our atmosphere D) all of these
In an AC circuit, the ratio of average current to maximum current is:
a. zero. c. 1.0. b. 0.707. d. 0.5.