A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 m T magnetic field is perpendicular to both the rod and its velocity. What is the magnetic flux swept through per second by the rod?
A. 0.0
B. 15 mT·m2
C. 30 mT·m2
D. 60 mT·m2
E. 12 mT·m2
D. 60 mT·m2
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A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5
As you read these words, the Sun is
A) gaining mass. B) losing mass. C) neither gaining nor losing mass. D) None of the above.
Time Dilation: One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship. At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A. (a) 20 y (b) 30 y B. (a) 30 y (b) 50 y C. (a) 50 y (b) 70 y D. (a) 70 y (b) 90 y
The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?
a. spectral analysis b. photometry c. interferometry d. resolving power e. cosmic analysis