Can you explain when fins may not be advantageous in increasing the heat transfer at a surface?
What will be an ideal response?
Fins may not be a good solution to situations where a highly corrosive,
extremely turbulent, or fluid having many suspended particles is in contact with
the surface.
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Camera Exposure: A lens of focal length 45 mm is mounted on a 35-mm camera. The lens aperture is set at f/2.0 and the shutter speed set at 1/2000 s. The photographer wants to keep the same exposure (amount of light), but wants to change the f-number to f/8.0 for greater depth of field. What should be the new shutter speed to maintain the same exposure?
A. 1/1000 s B. 1/500 s C. 1/4000 s D. 1/8000 s E. 1/125 s
A hair dryer draws 1 350 W, a curling iron draws 700 W, and an electric light fixture draws 550 W. If all three of these appliances are operating in parallel on a 120-V circuit, what is the total current drawn?
a. 7.22 A b. 21.7 A c. 2.09 A d. 27.5 A e. 11.3 A
Because of their greater luminosity, RR Lyrae stars can be used at greater distances than can long-period Cepheids
Indicate whether the statement is true or false
The Sun and the Moon have an angular size of approximately ________.
A. 1 degree B. 23.5 degrees C. 2.35 degrees D. 5 degrees E. 0.5 degree