Which of the following works best for fissioning a uranium nucleus?
A) Hit it with a neutron.
B) Hit it with a proton.
C) Heat it up to such a high temperature that collisions cause uranium nuclei to split.
D) Hit it with another uranium nucleus.
E) Hit it with an electron.
A
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Series/Parallel Circuits: Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal 50-V dc source. What is the current through each resistor?
A. 0.25 A B. 0.50 A C. 0.75 A D. 2.0 A E. 4.0 A
The tail of a comet always points
A) away from the Sun and becomes longest and brightest at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) toward the Sun and disappears at perihelion. E) in the direction of the comet's motion.
If y = 0.02 sin (30x ? 400t) (SI units), the frequency of the wave is
a. 30 Hz b. 15/? Hz c. 200/? Hz d. 400 Hz e. 800? Hz
Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of
A) lesser impulse in stopping. B) longer time to stop. C) both of these D) none of the above