Energy to support a reasonable total biomass of ongoing life in a Europan ocean would probably come from
A) sunlight filtering through the ice
B) organic material filtering down from the surface
C) deep-sea volcanic vents
D) meteoroid impacts on the surface
B
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Contrast the rotation rates of the jovian planets with the terrestrial planets
What will be an ideal response?
Show that for fully developed laminar flow between two flat plates spaced 2a apart, the Nusselt number based on the ‘bulk mean’ temperature and the passage spacing is 4.12 if the temperature of both walls varies linearly with the distance x, i.e., ?T/?x = C. The ‘bulk mean’ temperature is defined as but assume that one wall is insulated while the temperature of the other walls increases linearly with x.
GIVEN
• Fully developed laminar flow between two flat plates
• Spacing = 2a & ?T/?x = C
• Bulk mean temperature as defined above
• One wall is insulated
• The temperature of the other wall increases linearly with x
FIND
• The Nusselt number based on the bulk mean temperature (Nu)
ASSUMPTIONS
• Steady state
• Constant and uniform property values
• Fluid temperature varies linearly with x (This corresponds to a constant heat flux boundary)
SKETCH
In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV b. 17.43 eV c. 38.23 eV d. 3.370 eV e. 1.685 eV
The measure of how hot or cold something is compared to a freezing point is referred to as the