In this figure a light ray travels between air and glass. Which way did the light ray go?
a.
from the air into the glass
b.
from the glass into the air
c.
either A or B.
d.
None of the above—this depicts an impossible situation.
c
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The hot gas of the big bang seems to be cool at about 2.7 K because:
A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang. B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K. C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer. D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.
Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force 
the floor exerts on the first person to the force 
the rope exerts on the second person. Which statement is correct?
A.
B.
C.
is greater than , but they have the same direction.D.
is greater than , but they have opposite directions.E.
is less than , but they have the same direction.How much kinetic energy does a 0.30-kg stone have if it is thrown at 44m/s
A) 290 J B) 580 J C) 440 J D) 510 J
The process of injecting a thermoset polymer into a hot die is called ___________ molding.
Fill in the blank(s) with the appropriate word(s).