A piece of uranium can be made into nuclear explosive only after it is purified into uranium-235, because
A. the other naturally occurring isotopes of uranium interfere with efficient chain reactions.
B. uranium-235 is the heaviest isotope known to mankind.
C. it has to be soldered with lead for safety.
D. before purification, the uranium-235 nucleus will not split apart.
Answer: A
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Which terrestrial world has the highest average surface temperature?
A) Mercury B) Venus C) the Moon D) Mars E) Earth
Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
The lighter-colored bands in Jupiter's atmosphere are called ________.
A. zones B. cells C. belts D. layers E. gaps
A 2.0-kg object has a velocity of 
m/s at t = 0. A constant resultant force of 
then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?
A. 9.2 m/s B. 6.3 m/s C. 8.2 m/s D. 7.2 m/s E. 7.7 m/s