Saturn's cloud layers are thicker than Jupiter's, due to Saturn's ________ gravity
Fill in the blank(s) with correct word
lower or weaker
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If the total resistance between the steam and the air (including the pipe wall and scale on the steam side) in Problem 7.36 is 0.05 m2 K/W, calculate the temperature difference between the outer surface of the inner pipe and the air. Show the thermal circuit.
GIVEN
Atmospheric flow through an annulus with steam condensing in inner tube
Diameters Inside
(Di) = 25 cm = 0.25 m
Outside (Do) = 38 cm = 0.38 m
Steam temperature (Ts) = 149°C
Air velocity (V) = 6 m/s
Total resistance between the steam and air (At Rtot) = 0.05 (m2 K)/W
Air bulk temperature (Tb) = 38°C
From Problem 7.36 heat transfer coefficient on the outer surface of the inner pipe (c h) = 25.4 W/(m2 K)
FIND
The temperature difference between the outer surface of the inner pipe and the air (?T)
ASSUMPTIONS
Steady state
Steam temperature is constant and uniform
Heat transfer to the outer surface is negligible
Air temperature given is the average air temperature
Thermal resistance of inner tube wall and condensing steam is negligible (Inner tube wall surface
temperature = Ts)
SKETCH
The source of energy that illuminates a lamp in your home is
A) the power company. B) the electrical outlet. C) atoms in the bulb filament. D) the wire leads to the lamp. E) the source voltage.
The natural tendency of an object to remain at rest or in uniform straight-line motion is called ______________
Fill in the blank(s) with correct word
What two observable properties of a Cepheid variable are directly related to one another?
A) its luminosity and its mass B) the period between its peaks of brightness and its distance C) the period between its peaks of brightness and its luminosity D) its mass and its distance