Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is
A) 0.5 light-year.
B) 0.5 parsec.
C) 5 light-years.
D) 5 parsecs.
E) 2 parsecs.
E
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Repeat Problem 9.26 part (b) and (c) but assume that condensation occurs on a 5 cm-OD horizontal tube.
GIVEN
? SO2 condensing on a horizontal tube
? Tube outside diameter (D) = 5 cm = 0.05 m
? Pressure (p) 490 kPa
? SO2 properties
FIND
(a) Condensate film thickness (S) at 1.3 cm from the bottom (x = L – 1.3 cm = 0.187 m)
(b) The average heat transfer coefficient (hc)
(c) The rate of condensation (m) in kg/h
ASSUMPTIONS
? Steady state
? Laminar condensate flow
? Vapor density is negligible compared to the liquid density
SKETCH
Where do you have to be on the Earth to view a lunar eclipse?
What will be an ideal response?
If the speed of light is represented by c, what equation would you use to determine the distance light travels, x, in a time t?
A. x=c*t B. x=c/t C. x=c+t D. 1/x = c*t
How many nanoseconds does it take for a computer to perform one calculation if it performs 6.7 × 107 calculations per second?
A) 15 ns B) 67 ns C) 11 ns D) 65 ns