Explain in your own words: (a) what is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) what are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature.
GIVEN
(a) Steel plate with specified surface temperatures
(b) Steel plate with one specified temperature and another surface exposed to a fluid
FIND
(a) Modes of heat transfer
SKETCH
(a) Since the surface temperatures are specified, the only mode of heat transfer of importance is
conduction through the steel plate
(b) In addition to conduction to the steel plate, convection at the surface exposed to the fluid must be
considered
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A) 1/300,000 of a second (0.0000033 s) B) 1/6000 of a second (0.000017 s) C) 1/8 of a second (0.0125 s) D) 1/2 of a second (0.5 s)
A star's color is related to its surface temperature because
A) stars emit thermal radiation. B) the colors of stars depend mainly on the emission lines in the spectra. C) stars have absorption lines in their spectra. D) the color of a star depends on its mass, and mass is related to surface temperature.
Solar activity cannot disrupt communications on Earth
Indicate whether the statement is true or false
In his special theory of relativity, Einstein stated that the laws of physics are
A) different in different situations. B) common sense applied to microscopic and macroscopic things. C) the same in all frames of reference. D) the same in all uniformly moving frames of reference.