The density of a submerged submarine at rest is about the same as the density of
A) a crab.
B) iron.
C) a floating submarine.
D) water.
E) none of the above
Answer: D
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Bronco's speed increases after he dives from a hovering helicopter. Relative to an observer in the helicopter Bronco's momentum
A) also increases. B) remains unchanged. C) decreases.
Why can't x-ray and gamma-ray telescopes use the same designs as visible-light telescopes?
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U-235 and Pu-239 are both
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