The discovery of a supernova by Tycho Brahe in 1572 contradicted the commonly held belief that the universe was
A) unchanging
B) spherical
C) infinite
D) perfect
A
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Uniform motion is any motion at constant speed
Indicate whether the statement is true or false
If gypsum has a hardness of 2, what statement must be true about it?
-It can only be scratched with a knife or a wire nail -It can scratch glass -It can be scratched with a fingernail -It is twice as hard as talc, which has a hardness of 1
Which of the following comparisons between low-mass stars and high-mass main-sequence stars is true?
A) Low-mass stars are hotter and more luminous than high-mass stars. B) Low-mass stars are hotter but less luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars have the same temperature and luminosity as high-mass stars. E) Low-mass stars are cooler and less luminous than high-mass stars.
2 600 rev/min is equivalent to which of the following?
a. 2 600 rad/s b. 43.3 rad/s c. 272 rad/s d. 60.0 rad/s