In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are
A) hydrogen.
B) oxygen.
C) both the same
D) not enough information
Answer: B
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The heat transfer rate from hot air by convection at 100°C flowing over one side of a flat plate with dimensions 0.1-m by 0.5-m is determined to be 125 W when the surface of the plate is kept at 30°C. What is the average convective heat transfer coefficient between the plate and the air?
GIVEN
• Flat plate, 0.1-m by 0.5-m, with hot air flowing over it
• Temperature of plate surface (Ts) = 30°C
• Air temperature (T?) = 100°C
• Rate of heat transfer (q) = 125 W
FIND
• The average convective heat transfer coefficient, hc, between the plate and the air
ASSUMPTION
• Steady state conditions exist
SKETCH
The spectral sequence sorts stars according to
A) mass. B) surface temperature. C) luminosity. D) core temperature. E) radius.
You carry a 20-N box 5 m horizontally across a room. The work you do is
a. 0 b. 4 J. c. 100 J. d. none of the above.
Refer to the figure above. When the switch is closed in the primary circuit,
1) voltage is established in the primary coil 2) a current is established in the primary coil 3) a magnetic field builds up around the primary coil 4) all of the above and a voltage is induced in the secondary circuit principally because 5) of the voltage in the primary. 6) of the change of current in the primary. 7) the expanding magnetic field about the primary is sensed by the secondary.