Distinguish between a precipitate and a filtrate
A precipitate is usually a solid that separates from a solution as a result of some
physical or chemical change and can be removed by filtration. A filtrate is the liquid
that has passed through a filter.
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Most stars in the Milky Way probably formed:
A) alone. B) in intergalactic space, then were swept up into the Galaxy. C) in clusters in the Galaxy's spiral arms. D) from planetary nebulae. E) in the galactic Nucleus, then migrated outward later.
In order to produce a hologram, one needs, in addition to an object and a piece of photographic film,
A) a beam of monochromatic light and a mirror. B) a beam of coherent light and a lens. C) a beam of monochromatic light and a lens. D) a beam of coherent light and a mirror.
It is 12:00 noon local solar time at 75°W. The date is March 21 . At which of the following longitudes would an observer be able to see the last-quarter moon rising?
a. 105°W b. 75°E c. 15°W d. 105°E
Why Bode's law was never considered a law of physics?
a. Because it is not testable. b. Because it is not consistent. c. Because it turned out not to be true. d. Because it had no scientific basis. e. Because it wasn't invented by Bode.