The larger variation in brightness in an eclipsing system consisting of a white dwarf and an M3 main-sequence star occurs when the white dwarf passes behind the M3 star
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following are typically found in the halo of our galaxy?
A) open star clusters B) stars of spectral types O and B C) globular star clusters D) cold gas and dust E) all of the above
A horizontal 2.5-cm-OD tube is maintained at a temperature of 27°C on its outer surface. Calculate the average heat transfer coefficient if saturated steam at 12 kPa is condensing on this tube.
GIVEN
? Saturated steam condensing on a horizontal tube
? Tube outside diameter (D) = 2.5 cm = 0.025 m
? Tube outer surface temperature (Ts) = 27°C
? Steam pressure (p) = 12 kPa
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 12 kPa
You are racing away from Earth in a super space ship in which you can continually increase your speed by firing engines that never quit. Which of the following best explains how people on Earth will perceive your speed?
A) They will see your speed getting closer and closer to the speed of light, but never reaching it. B) They will know you are going very fast, but will have no way to know if you ever exceed the speed of light. C) They will see you speed up until you reach the speed of light, and then your speed will remain constant after that. D) They will see you going faster and faster until you reach the speed of light, and after that they won't be able to see you any more.
. 
Reference: Ref 5-1
The latent heat of fusion is the amount of energy per kilogram necessary to go from point ______________ to point ______________.