When a load is placed on a properly arched structure, compression
A) weakens the structure.
B) strengthens the structure.
C) neither of these
Answer: B
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Which is always true of an uncharged object?
a. It has no charge whatsoever in any part of its structure. b. It has equal amounts of positive and negative charge. c. It is grounded. d. It is not attracted by a charged object. e. It is composed of positively charged electrons and negatively charge protons.
State the cosmological principle
What will be an ideal response?
A possible design of a "warp drive" might involve
A) generating a shortcut between two distant parts of the universe through a black hole B) placing a movable massive object like a black hole in front of a spacecraft and using its gravity to shorten the spatial distances in front of the rocket C) using the annihilation of matter and antimatter to accelerate a spacecraft close to the speed of light D) generating a shortcut between two distant parts of the universe through hyperspace
In a gaseous mixture of hydrogen and oxygen, the molecules having the greater average kinetic energy are
A) hydrogen. B) oxygen. C) both the same D) not enough information