At what Fahrenheit temperature are the Kelvin and Fahrenheit temperatures numerically equal?
574.6°F = 574.6 K
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What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic. B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force. C) Opposite electric charges attract and like charges repel. D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge. E) Alternating current and direct current are both capable of doing work.
At the microscopic level, the difference between gases and solids is that
A) there is much more distance (at least 10 times more) between neighboring atoms in a gas than between neighboring atoms in a solid. B) the gas's atoms move throughout the gas, while the solid's atoms remain near their original locations. C) in a gas, the individual atoms are larger. D) both answers A and B are correct. E) both answers B and C are correct.
When warm air is above cooler air it is called
A) stable. B) unstable. C) a temperature inversion. D) a Chinook.
What are all the blue lines connecting to Jupiter supposed to represent in this picture?
A) Jupiter's magnetic field B) the solar wind C) blue light reflected from methane clouds D) the orbits of some of Jupiter's many moons.