A two-shell-eight-tube-pass heat exchanger is used as an economizer by heating a 1000 l/min 10ºC stream of water with another 1000 l/min stream of 75ºC water. If the NTU value for the economizer is 0.45, what are the outlet temperatures of the two streams of water?
What will be an ideal response?
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How does the rotation curve method differ from the analysis of binary stars?
What will be an ideal response?
Why is January a cold month in the northern United States?
A) Earth is near its farthest point from the sun. B) There's more snow in January. C) The northern hemisphere is farther from the sun than the southern hemisphere. D) The northern hemisphere is tilted away from the sun.
What change slowly occurs during the main-sequence lifetime of a star?
A) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity. B) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. C) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. D) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity.
A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet. b. The second loop is affected by the thermal exchange from the heating of the first loop. c. It is a gravitational effect on the electrons. d. It is done via an electromagnetic wave.