The light curve of a/an ___________ binary can reveal both masses and diameters of the stars
Fill in the blank(s) with correct word
eclipsing
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Determine the heat transfer area requirements of Problem 10.40 if (a) 1-2 shell and tube, (b) an unmixed crossflow, and (c) a parallel flow heat exchanger are used, respectively.
GIVEN
• An air-to-gas heat exchanger
• Entering temperatures
? Ta,in = 350°C
? Tg,in = 700°C
• Mass flow rates: ma = mg = 5 kg/s
• Specific heats: cpa = cpg = 1.05 kJ/(kg K) = 1050 J/(kg K)
• Overall heat transfer coefficient (U) = 75 W/(m2 K)
FIND
The heat transfer area (A) as a function of the effectiveness (e) for (a) A 1-2 shell and tube heat exchanger (b) An unmixed crossflow heat exchanger (c) A parallel flow heat exchanger
ASSUMPTIONS
• For case (a) the air is in the tubes
SKETCH
1400 rev/min is equivalent to which of the following?
A) 23.3 rad/s B) 146.6 rad/s C) 8796 rad/s D) 40 rad/s
It requires 0.30 kJ of work to fully drive a stake into the ground. If the average resistive force on the stake by the ground is 828N how long is the stake?
A) 0.23 m B) 0.31 m C) 0.41 m D) 0.36 m
Before about 50,000 years after the Big Bang the universe was
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.