What did the IAU establish in 1928?
a. The IAU classified Pluto as a dwarf planet
b. The IAU published official names of all constellations.
c. The IAU recorded 88 constellations with defined boundaries.
d. The IAU recognized additional orbiting bodies in the Kuiper Belt.
e. The IAU recorded all the mythologies associated with 88 constellations.
c
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For a projectile launched horizontally, the vertical component of its velocity
A) is zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) any of the above, depending on position.
Why do white-dwarf supernovae all have the same maximum luminosity?
What will be an ideal response?
The use of wave fronts and rays to describe optical phenomena is called
A) wave optics. B) geometrical optics. C) dispersive optics. D) quantum optics.
For safety reasons, a heat exchanger performs as shown in (a) of accompanying figure. An engineer suggests that it would be wise to double the heat transfer area so as to double the heat transfer rate. The suggestion is made to add a second, identical exchanger as shown in (b). Evaluate this suggestion, that is, show whether or not the heat transfer rate would double.
GIVEN
Case 1
Heat exchanger as shown above.
• Overall heat transfer coefficient times the transfer area (UA) = 40,000 kJ/(hr K)
• Heat capacity rates
? Ch = 80,000 kJ/(h K)
? Cc = 40,000 kJ/(h K)
• Entering temperatures
? Tb,in = 400 K
? Tc,in = 300 K Case 2 Two of the same heat exchanges as shown above in Figure B. FIND
• Does the heat transfer rate double?
ASSUMPTIONS
• Heat exchangers are simple counterflow geometry