The idea in fission-bomb design is to
A) form a supercritical mass from one or more subcritical masses.
B) bring neutrons and subcritical uranium together.
C) both of these
D) neither of these
Answer: A
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Magnetic Field of a Long Wire: A negatively charged particle -Q is moving to the right, directly above a wire having a current I flowing to the right, as shown in the figure. In what direction is the magnetic force exerted on the particle due to the current?
A. into the page B. out of the page C. downward D. upward E. The magnetic force is zero because the velocity is parallel to the current.
Which of the following represents a partial or total decarbonization of our energy supply?
A) switching from natural gas to nuclear power B) switching from coal to natural gas C) switching from oil (petroleum) to natural gas D) All of the above. E) None of the above.
Two masses m1 and m2, with m1 = 3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
a. 3 v b. v/3 c. 3v/4 d. v
Thomson discovered the ______________ in 1897
Fill in the blank(s) with correct word