Long-period comets originate in the _______________
Fill in the blank(s) with correct word
Oort cloud
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The odds of a 100-meter asteroid hitting Earth over the course of one year is approximately __________.
Fill in the blank(s) with the appropriate word(s).
A wave's velocity is the product of the
A) frequency times the period of the wave. B) period times the energy of the wave. C) amplitude times the frequency of the wave. D) frequency times the wavelength of the wave. E) amplitude times the wavelength of the wave.
Two glass slides are separated by a thin layer of plastic. The glass has an index of refraction nglass and the plastic has an index nplastic. The two indices are not equal. If nplastic = 1.50, for what minimum non-zero thickness of plastic will the transmitted light be for a beam of wavelength 600 nm?
1.400 nm 2.200 nm 3.100 nm 4.One needs to know which of the indices is the greater to solve this.
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
