Which of the following statements is true?
A. electric field lines stay inside equipotent surfaces
B. equipotent surfaces intersect in straight lines
C. equipotent surfaces intersect in curved lines
D. electric field lines are perpendicular to equipotent surfaces
E. equipotent surfaces are parallel to each other
D. electric field lines are perpendicular to equipotent surfaces
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The distance traveled by a wave during a single period is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) none of the above
The change in shape due to transport of atoms through the bulk of the material is called _________ creep.
Fill in the blank(s) with the appropriate word(s).
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
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
GIVEN
• Fully developed laminar flow between two flat plates
• Spacing = 2a & ?T/?x = C
• Bulk mean temperature as defined above
FIND
• Show that the Nusselt number based on the bulk mean temperature = 4.12
ASSUMPTION
• Steady state
• Constant and uniform property values
• Fluid temperature varies linearly with x (This corresponds to a constant heat flux boundary)
SKETCH
