A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles. If the resistance per length in the wire is 0.5 ?/mile, what is the power loss due to resistive losses?
50 MW
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A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.28 
B. 1.44
C. 1.65
D. 1.72
E. 1.98
A person would like to pull a car out of a ditch. This person ties one end of a chain to the car’s bumper and wraps the other end around a tree so that the chain is taut. The person then pulls on the chain perpendicular to its length, as shown in the picture. The magnitude of the force that the chain exerts on the car in this situation is
A. Much smaller than the force the person exerts on the chain. B. About equal to the force the person exerts on the chain. C. Much bigger than the force the person exerts on the chain.
The Chandra X-Ray Observatory must operate in space because
A) X-rays are too dangerous to be allowed on the ground. B) X-rays do not penetrate Earth's atmosphere. C) X-ray telescopes require the use of grazing incidence mirrors. D) It was built by NASA.
The distinguishing feature of a starburst galaxy is ________
A) strong radio emission from "lobes" of material well outside the visible boundaries of the galaxy B) a very large luminosity compared to the total luminosity of the Milky Way C) a rate of star formation that may be 100 or more times greater than that in the Milky Way D) the presence of an unusually large number of binary star systems containing X-ray bursters