A mass attached to a spring vibrates back and forth. At the equilibrium position, the
A) velocity reaches zero.
B) acceleration reaches a maximum.
C) net force reaches a maximum.
D) velocity reaches a maximum.
Answer: D) velocity reaches a maximum.
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If we double the mass of an object without a change in volume, its density would be
A) half. B) double. C) unchanged.
Most of the hot, young blue stars lie in the ________ of our Galaxy
A) bulge B) globular clusters C) central bar D) spiral arms E) halo
The brightest main-sequence star in a cluster has a temperature of 10,000 K and a luminosity about 100 times greater than the sun. What is the approximate age of the cluster?
A) About 1011 years B) About 107 years C) About 109 years D) This cannot be answered using the HR diagram.
If you are ever fortunate enough to experience a total eclipse of the Sun, you can be sure that it will happen when the Moon is
A. in the "new Moon" phase. B. full. C. in its "first quarter" phase. D. in its "last quarter" phase. E. No way to tell; it's a matter of chance