Buoyancy: A boat loaded with rocks is floating in a swimming pool. If the rocks are thrown into the pool, the water level in the pool, after the rocks have settled to the bottom,
A. rises.
B. falls.
C. stays the same.
Answer: B
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A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth,
Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 years B) 12 years C) 15 years D) 18 years E) 20 years
Compared with a mercury barometer, the column height for a water barometer would be
A) lower. B) higher. C) the same.
Star A has the peak of its blackbody radiation at lA. Star B has its peak at lB, which is one-third that of lA. If Star A's surface temperature is TA, how does the surface temperature TB of Star B compare?
a. TB = TA/9 c. TB = 9 TA b. TB = 3 TA d. TB = TA/3
Which of the above molecules is a phenol?
A) a B) b C) c D) d E) a and d