If all the "dark matter" in the Universe were to be, somehow, instantaneously removed, which of the following would not happen?
A) The Solar System would fly apart.
B) The Milky Way would fly apart.
C) Clusters of galaxies would fly apart.
D) The Universe would expand forever.
E) all of the above
A
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If Star A is closer to us than Star B, then Star A's parallax angle is
A) smaller than that of Star B. B) larger than that of Star B. C) hotter than that of Star B. D) fewer parsecs than that of Star B.
As the temperature of a radiation emitting blackbody becomes lower, what happens to the peak wavelength of the radiation?
a. remains constant b. increases c. decreases d. is directly proportional to temperature
How is heat exchanger efficiency described?
What will be an ideal response?
Mathematically, the product of mass, velocity, and radius is called _____
A) specific gravity B) angular momentum C) linear energy D) spectral radius