The percentage of electricity from nuclear power generated in recent decades in the United States has been about
A) 10%.
B) 20%.
C) 30%.
D) 40%.
E) more than 40%
Answer: B
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How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
a) same amount of work b) twice the work c) 4 times the work d) 8 times the work
Which of the following statements is not one of Newton's Laws of Motion?
A) What goes up must come down. B) The rate of change of momentum of an object is equal to the net force applied to the object. C) In the absence of a net force acting upon it, an object moves with constant velocity. D) For any force, there always is an equal and opposite reaction force.
One sometimes hears reference to a "20-kiloton" bomb. What does this mean?
A) It means 20,000 tons of nuclear explosive is used in the bomb. B) It means that the number of "fissile" nuclei is equal to the number of trinitrotoluene molecules in 20,000 tons of TNT explosive. C) It means that the total weight of the bomb (not just the uranium) is 20,000 tons. D) It means that the energy released by the bomb is equal to the energy released when 20,000 tons of TNT is exploded. E) This refers to the maximum pressure generated by the bomb when it explodes.
The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________
Fill in the blank(s) with correct word