Electric field is dimensionally equivalent to which of the following?
a. N/m/C
b. N/C
c. N/m2/C2
d. N/C2
b
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Determine the heat transfer coefficient for liquid bismuth flowing through an annulus (5-cm-ID, 6.1-cm-OD) at a velocity of 4.5 m/s. The wall temperature of the inner surface is 427°C and the bismuth is at 316°C. It may be assumed that heat losses from the outer surface are negligible.
GIVEN
FIND
The heat transfer coefficient
ASSUMPTIONS
Steady state
Heat losses from outer surfaces are negligible
SKETCH
PROPERTIES AND CONSTANTS
for bismuth at the bulk temperature of 316°C
To connect a pair of resistors so their equivalent resistance (the single resistor having their combined value) will be least, connect them in
A) series. B) parallel. C) either of these
A stars exhibit strong hydrogen absorption lines because the surface temperature of 10,000 K is high enough to place most hydrogen in an excited, but not yet ionized, state
The transitions from this excited state then correspond to visible light wavelengths. Which of the following statements is a plausible explanation for why G stars exhibit weak hydrogen absorption lines? A) G stars contain very little hydrogen. B) At these high temperatures, nearly all the hydrogen is ionized, and unable to interact with light. C) G stars are too cool to excite hydrogen atoms to the first energy level from which they can then absorb visible wavelengths of light.
Our whole galaxy is about ____ times larger in size.
A.) 100. B.) 1,000. C.) 10,000. D.) 100,000. E.) 1,000,000.