The subscript ______ stands for ________ to remind you that only information on visible light is given
Fill in the blank(s) with correct word
V, visual
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In gas turbine recuperators, the exhaust gases are used to heat the incoming air and Cmin/Cmax is therefore approximately equal to unity. Show that for this case e = NTU/(1 + NTU) for counterflow and e = 1/2 (1 – e– 2NTU) for parallel flow.
GIVEN
• Gas turbine recuperator
• Cmin /Cmax ? 1
FIND Show that
(a) e = NTU/(1 + NTU) for counterflow
(b) e = 1/2 (1 – e– 2NTU) for parallel flow
SKETCH
Eratosthenes' measurements of Earth's size involved
A) a deep well in Syene. B) a pillar's shadow in Alexandria. C) surveying the distance between Alexandria and Syene. D) all of the above
A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. How much current is flowing in the tube, if the radius of the tube is 0.495 mm?
A) 18 A B) 29 A C) 180 A D) 280 A
Radio galaxies are generally bright at only radio wavelengths
Indicate whether the statement is true or false