An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
A
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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
Archimedes' principle applies to
A) liquids. B) gases. C) fluids. D) all of the above
In the operation of a steam-electric generating plant, the thermal energy input occurs
A) in the electric generators. B) in the condenser. C) at the point where the energy from the furnace is transferred into the boiler. D) at the point where the fossil or other fuel is shipped into the plant area. E) at the point where the hot steam pushes against the turbine.
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
A) It increases. B) It decreases. C) It remains constant. D) cannot be determined from the information given