The direct transition from solid ice to gaseous water vapor is known as _______.
What will be an ideal response?
sublimation
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An object that has zero resistance is a
a. semiconductor. b. superconductor. c. diode. d. transistor. e. positive ion.
Imagine that this classroom contains a constant magnetic field that points from the front to the back. In front of you a negative charge is slowly moving horizontally to your left. As you watch, the magnetic force on the charge
A. deflects the charge away from you. B. deflects the charge into a clockwise directed vertical circle. C. has no effect on the charge. D. deflects the charge into a counterclockwise vertical circle. E. deflects the charge toward you.
Which is larger, a calorie or a joule?
a. calorie b. joule c. Neither—they are the same. d. They cannot be compared since they measure different physical quantities.
Which three Galilean moons were found by Galileo to have weak, changing magnetic fields?
A) Titan, Callisto, and Amalthea B) Io, Europa, and Callisto C) Io, Amalthea, and Ganymede D) Io, Europa, and Ganymede E) Europa, Ganymede, and Callisto