An ideal gas is compressed to one-half its original volume during an isothermal process. The final pressure of the gas
A) increases to twice its original value.
B) increases to less than twice its original value.
C) increases to more than twice its original value.
D) does not change.
A
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If the magnetic field from a current-carrying long straight wire has a magnitude 
at a distance d, what is the magnitude of the field at a distance 2d?
A. also 
B. 0.707
C. 0.693
D.
/2
E. 
/4
A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?
A) the string pulling downward on the ceiling with an 8-N force B) the ceiling pulling upward on the string with an 8-N force C) the string pulling upward on the toy with an 8-N force D) the toy pulling upward on the Earth with an 8-N force E) the toy pushing downward on the Earth with an 8-N force
Most coal deposits were formed in the
A) Cenozoic era. B) Mesozoic era. C) Paleozoic era. D) Precambrian era.
The entropy of a system measures its:
a. organization – disordered systems have low entropy. b. organization – disordered systems have high entropy. c. energy – low energy systems have low entropy. d. energy – low energy systems have high entropy. e. temperature – high temperature systems have low entropy.