In structure, our Milky Way is most similar to:
A) the Large Magellanic Cloud.
B) an upscale version of a globular cluster.
C) M-31, the Andromeda Galaxy.
D) the Orion nebula.
E) None of these.
C
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Two different materials are in contact as shown in the figure. Determine the temperature distribution through the two materials after 10 minutes using a 1 inch grid as shown.
The discovery of Charon was significant because it allowed astronomers to determine the ________ and ________ of Pluto.
A. radius; speed B. age; mass C. speed; distance D. distance; age E. mass; radius
In what sense is our modern concept of an "atom" not accurate to its ancient meaning?
A) "Atom" means indivisible, but we now know that atoms are actually made of smaller particles. B) "Atom" means particle, but we now know that particles also have the properties of waves. C) "Atom" means identical, but we now know that not all atoms are the same. D) "Atom means solid, but we now know that atoms are mostly empty space.
Two lasers emit equal numbers of photons per second. If the first laser emits red light and the second emits blue light, the power radiated by the first is
A. equal to that emitted by the second. B. greater than that emitted by the second. C. less than that emitted by the second. D. dependent on the time interval of the emission.