Contrast open clusters and associations
What will be an ideal response?
Open clusters contain more stars, are better bound gravitationally, and will last much longer-hundreds of millions or billions of years. Associations are less massive clusters spanning a larger region of space, they are less bound, and will break up in tens of millions of years as the Galaxy spins.
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The suffix -ol in a compound's name signifies
a. an enzyme. b. an amide. c. an alcohol. d. a carbohydrate.
Divergent boundaries are areas of
A) tensional forces that stretch the crust and generate a spreading center. B) compressional forces that crunch the crust and generate a spreading center. C) compressional forces that crunch and shorten the crust by folding and faulting. D) plate collision.
A pair of observers moving relative to one another will always agree upon all but which of the following:
A. the length of a space-time interval between two events B. their respective rest masses C. whether two events are simultaneous D. their relative velocity E. the relativistic factor gamma that links their reference frames
Snell's Law: A plastic cube is immersed in water having an index of refraction of 1.33. A laser beam in the plastic strikes the interface at an angle of 14.5° with the normal in the plastic. In the water, this beam makes an angle of 21.8° with the normal. What is the speed of light in the plastic cube? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).