Magnetic confinement is used in controlled fusion experiments to
a. provide neutrons.
b. accelerate nuclei.
c. control a plasma.
d. excite nuclei into higher energy levels.
e. inject energy into nuclei.
c
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What is the current flowing through the 2-? resistor?
a.
2 A
b.
3 A
c.
4 A
d.
6 A
The planet COROT-14b is only slightly larger than Jupiter, but is several times more massive. Which is the most plausible explanation for its similar size to Jupiter?
A) Planets that are close to a star are heated up and therefore larger. B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. 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 even under their own gravity to a higher density than Jupiter.
Because of trapped air inside, snow is a
A) poor conductor. B) good insulator. C) both of these D) none of the above
A 905-g meteor impacts the earth at a speed of 1629 m/s. If all of its energy is entirely converted to heat in the meteor, what will be the resulting temperature rise of the meteor, assuming it does not melt? The specific heat for the meteor material
is 472 J/kg?K, which is about the same as that of iron. A) 2,540,000°C B) 11,700°C C) 2810°C D) 3.10°C