A heat exchanger uses a staggered tube arrangement of 1 in diameter tubes and with ST = SD = 3 inches. There are four columns of 10 tubes per column and all of the tube surfaces are at 190ºF. Atmospheric air at 80ºF and 14.5 psia is forced across the tube tank at 5 ft/s. Determine the air temperature downstream from the tube bank and the downstream pressure.
What will be an ideal response?
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A white dwarf is
A) a cool and very small main sequence star with a mass of less than 1.4 of a solar masses. B) a hot but very small main sequence star with a mass of less than 1.4 solar masses. C) the exposed core of a dead star, supported by electron degeneracy pressure. D) the name for the singularity at the center of a black hole. E) the exposed core of a dead star, supported by neutron degeneracy pressure.
Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. The required ratio of the applied forces P1/P2 so that joint B rotations ?B1 and ?B2 are equal is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
Nearsightedness can usually be corrected with
A) converging lenses. B) diverging lenses. C) achromatic lenses. D) cylindrical lenses. E) spherical lenses.
The separation between Africa and Arabia is a(n) ____________________ valley
Fill in the blank(s) with correct word