Which of the following best describes the distribution of the dark matter in a spiral galaxy?
A) approximately spherical and about the same size as the galaxy halo
B) approximately spherical and about 10 times the size of the galaxy halo
C) flattened in a disk and about the same size as the stellar disk
D) flattened in a disk but about 10 times larger than the stellar disk
E) predominantly concentrated in the spiral arms
B) approximately spherical and about 10 times the size of the galaxy halo
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The planet Uranus is:
A) easily visible with the naked eye. B) barely visible with the naked eye. C) only visible with a small telescope or binoculars. D) only visible with a large, high quality telescope. E) only visible with a space-based telescope.
In composition and density, the asteroids most resemble:
A) comets. B) the Sun. C) jovian moons. D) pieces of terrestrial planets. E) Kuiper Belt objects like Pluto.
A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (? = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
a. 218 b. 109 c. 55 d. 318 e. 443
The 50-kg stuntman places a 50-kg uniform 6-meter plank on top of a skyscraper and stands on the tip of it that overhangs the building as shown. What is the approximate distance that the overhang can be extended without disaster?
1) 0.5 m 2) 1 m 3) 1.5 m If the 6-meter board has a mass of only 25 kilograms, then the maximum overhang distance would be about 5) 0.5 m. 6) 1 m. 7) 1.5 m. 8) 2 m.