The supernova that formed M-1, the Crab Nebula, was observed in:
A) 1572 AD by Tycho Brahe.
B) 1604 AD by Johannes Kepler.
C) 1054 AD by Chinese and Middle Eastern astronomers.
D) 1006 by observers in the southern hemisphere.
E) about 9,000 BC by all our ancestors.
C
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Two vertical tubes of equal cross-sectional areas are filled with liquids to heights producing atmospheric pressure at their bottoms. One liquid is water and the other is mercury. Both liquids have equal
A) volumes. B) densities. C) weights. D) viscosity. E) none of the above
Which of the following could not be measured by an observation that uses only imaging?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the brightness of a star in our sky E) the number of bright stars in a nearby star cluster
The tides on Earth are an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) none of the above
If the polarizing angle for diamond is 67.5°, what is the index of refraction of this material?
a. 2.00 b. 2.20 c. 2.41 d. 2.65