Why does the high specific heat of water make it useful as a coolant?
What will be an ideal response?
Something that has a high specific heat will not increase its temperature as much
for a given transfer of heat as something that has a low specific heat.
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Northern hemisphere winters are colder than northern hemisphere summers because
a. Earth is closer to the Sun during the summer than it is during the winter. b. the snow that falls in the northern latitudes cools Earth during the winter. c. the light from the Sun shines more directly on the northern hemisphere during the summer. d. the period of sunlight is longer during the summer than during the winter. e. the light from the Sun shines more directly on the northern hemisphere during the summer and the period of sunlight is longer during the summer than during the winter.
Atmospheric air at a velocity of 61 m/s and a temperature of 16°C enters a 0.61-m-long square metal duct of 20 × 20 cm cross section. If the duct wall is at 149°C, determine the average heat transfer coefficient. Comment briefly on the L/Dh effect.
GIVEN
Atmospheric air flow through a square metal duct
Air velocity (V) = 61 m/s
Inlet air temperature (Tb,in) = 16°C
Duct dimensions: 20 cm × 10 cm × 0.61 m = 0.2 m × 0.2 m × 0.61 m
Duct wall surface temperature (Ts) = 149°C
FIND
The average heat transfer coefficient (c h)
ASSUMPTIONS
Steady state
Constant and uniform wall surface temperature
SKETCH
Both Pluto and Charon are tidally locked to always keep the same faces toward each other, rotating and revolving around their common center of mass every 14.2 hours
Indicate whether the statement is true or false
The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K b. 100 K c. 900,000,000 K d. 90,000 K e. 10,000 K