You hold one end of a solid rod in a fire, and the other end becomes hot. This is an example of
a. heat conduction.
b. heat convection.
c. heat radiation.
d. thermal expansion.
e. none of the above.
a
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Magnetic Field of a Long Wire: A long, straight, horizontal wire carries current toward the east. A proton moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the proton?
A. toward the north B. toward the south C. upward D. downward E. toward the east.
If you hold two objects that have the same weight density, then they
A) may have unequal mass densities. B) have equal mass densities. C) are equal in weight.
Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton
Indicate whether the statement is true or false
Of the various wavelengths emitted from a hydrogen gas discharge tube, those associated with transitions from higher levels down to the n = 2 level produce which of the following?
a. visible c. ultraviolet b. infrared d. a mixture of visible and ultraviolet