When a battery does 24 J of work on 10 C of charge, the voltage it supplies is
A) 2.4 V.
B) 4.2 V.
C) 24 V.
D) 240 V.
E) none of the above
Answer: A
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An organism with an Encephalization Quotient (EQ) of 1 is expected to be of
A) above-average intelligence B) average intelligence C) the lowest possible intelligence D) below-average intelligence
Two uses of ultrasound are navigation by bats and controlling insects
Indicate whether the statement is true or false
For someone in the Northern Hemisphere stars rise in the east and set in the west. For someone in the Southern Hemisphere
A. the opposite is true-stars rise in the west and set in the east. B. the situation is the same-stars also rise in the east and set in the west.
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
