A nuclear power plant has an actual efficiency of 33%. If of energy are released from fission, how much electric power does the power plant produce?
A) 0.063 MW
B) 6.3 MW
C) 25 MW
D) 0.25 MW
A
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When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?
A) 4.8 m/s B) 4.3 m/s C) 3.8 m/s D) 3.4 m/s
On Earth, according to current ideas about plate tectonics, ____________ were once together
a. Africa and South America b. Africa and North America c. North America and Europe d. Africa and South America; Africa and North America; and North American and Europe
Suppose the star Sirius were moved to a distance 7 times closer to Earth than it is now. How would its apparent brightness change?
A) It would be 7 times as bright. B) It would be 1/7 as bright. C) It would be 1/49 as bright. D) It would be 49 times as bright.
When a low mass star first runs short of hydrogen in its core, it becomes brighter because
A) its outer, cooler layers are shed, and we see the brighter central core. B) it explodes as a nova. C) the core contracts, raising the temperature and extending the hydrogen burning shell outward. D) the helium flash increases the size of the star immensely. E) helium fusion gives off more energy than does hydrogen.