In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of
A) hydrogen.
B) oxygen.
C) nitrogen.
D) all the same
Answer: A
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Which one of the following statements is true concerning resistors connected in series within an electric circuit?
a) The potential difference across each of the resistors is the same. b) The current through each of the resistors is the same. c) The energy dissipated by each of the resistors is the same. d) The resistance of each of the resistors is the same. e) The resistivity of each of the resistors is the same.
Why is it believed that large parts of the United States were once covered by shallow seas?
What will be an ideal response?
A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) The induced current flows counterclockwise. B) There is no induced current in this coil. C) The induced current flows clockwise. D) The current flows clockwise initially, and then it flows counterclockwise before stopping.
The scientific method holds that no theory is valid unless its predictions are in accord with ______________
Fill in the blank(s) with correct word