All neutrinos are left handed
Indicate whether the statement is true or false
T
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A body of water at 80ºF has still air at 80ºF, 14.7 psia, and 10% relative humidity above it. Estimate the evaporation rate of water into the air when the air has 20% relative humidity 3 feet above the water surface.
What will be an ideal response?
What is the cause of the lobes in a double-lobed radio galaxy?
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Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5 cm-ID, 60 cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16°C and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/( m2 K). The properties of the oil at various temperatures are listed in the accompanying tabulation
GIVEN
• Oil flowing through a copper tube with atmospheric pressure steam condensing on the outer surface
• Oil properties listed above
• Inside diameter (D) = 2.5 cm = 0.025 m
• Tube length (L) = 60 cm = 0.6 m
• Oil velocity (V) = 0.03 m/s
• Inlet oil temperature (Tb,in) = 16°C
• Heat transfer coefficient on outside of pipe ( ,c o h )= 11.3 kW/(m2 K)
FIND
• The rate of heat transfer (q) to the oil
ASSUMPTIONS
• Steady state
• The thermal resistance of the copper tube is negligible
• Constant wall temperature
• The tube wall is thin
SKETCH
PROPERTIES AND CONSTANTS
At atmospheric pressure, steam condenses at a temperature (Ts) of 100°C.
At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is 0.036 kg/m3
a. True b. False Indicate whether the statement is true or false