The neutral hydrogen atom consists of
a. one proton and one neutron.
b. one proton.
c. one proton, one neutron, and one electron.
d. one proton and one electron.
e. an isotope and an ion.
D
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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
A fixed amount of ideal gas is held in a rigid container that expands negligibly when heated. At 20°C the gas pressure is p. If we add enough heat to increase the temperature from 20°C to 40°C, the pressure will be
A) impossible to determine since we do not know the number of moles of gas in the container. B) greater than 2p. C) less than 2p. D) equal to 2p. E) impossible to determine since we do not know the volume of gas in the container.
Which of the following best describes how modern astronomers view astrology?
A) Astrology played an important part in the development of astronomy in ancient times, but it is not a science by modern standards. B) Astrology is a synonym for astronomy. C) Astrology was a great idea until it was disprove by the work of Copernicus, Tycho, Kepler, and Galileo. D) Astrology is new age mumbo-jumbo that was a waste of time when it was invented thousands of years ago and remains a waste of time today.
If the electric potential at a point in space is zero, then the electric field at that point must be
A) negative. B) zero. C) uniform. D) positive. E) impossible to determine based on the information given.