A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 200 miles. If the resistance in the wire is 1 ?/mile, what is the power loss due to resistive losses?
a. 20 kW
b. 200 kW
c. 20 MW
d. 200 MW
e. 200 W
d
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Quantum field theory arises out of the combination of
A) quantum theory and nuclear physics. B) the general theory of relativity and quantum theory. C) the special theory of relativity and the theory of electromagnetism. D) the special theory of relativity and quantum theory. E) quantum theory and the big bang theory of the creation of the universe.
A solar eclipse occurs when the
A) Sun passes into Earth's shadow. B) Moon passes into Earth's shadow. C) the Moon's shadow is cast on Earth. D) none of the above
A satellite is held in orbit by a 1 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.0×108 J. b. 8.0×108 J. c. 1.0×1011 J. d. 0. e. 8.0×1011 J.
A key feature of the Falkirk Wheel in Scotland is that opposite gondolas have the same weight when both are brim-full of water
A) and boats in each have about equal weights. B) and at least one boat is in each gondola. C) regardless of the weights of boats or no boats in each. D) none of the above