The percentage of 235U--as opposed to 238U--present in light-water uranium power reactors is closest to
A) 90 percent. B) 50 percent. C) 5 percent. D) 75 percent. E) 25 percent.
C
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All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle. B. they do not operate through a reversible cycle. C. the working substance does not maintain a constant volume through the cycle. D. the working substance does not maintain a constant pressure through the cycle. E. the working substance does not maintain a constant temperature through the cycle.
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. E. B. F. C. G. D. H. E. A.
When a force acts in a direction opposite to the motion, ________ work is said to be done on the object.
Fill in the blank(s) with the appropriate word(s).
John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
a. 19 m/s b. 25 m/s c. 610 m/s d. 22 m/s e. 12 m/s