A large 8 ft by 4 ft thermopane glass window loses 300 Btu/hr of heat when the inside temperature is 70ºF. If the thermopane has an average thermal conductivity of 0.032 Btu/hr·ft·ºF and is ½ inch thick, estimate the outside temperature of the window.
What will be an ideal response?
Using Fourier’s law of conduction we have
You might also like to view...
You can reason that the time required for a ball to fall is related to the height from which it falls and to the acceleration due to gravity. Time is measured in seconds, height in meters, and gravitational acceleration. Using dimensional analysis, determine how the time to fall from height h compares to the time required to fall from height 2h.
A. It takes 1/2 as long
B. It takes 4 times as long
C. It takes 
times as long
D. It takes 2 times as long
E. It takes 
as long
F. It takes 1/4 as long
Evidence for the existence for Pangaea includes
a. biological evidence only. b. continuity of geologic features only. c. glacial evidence only. d. all of the above.
A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above the horizontal. How much work does gravity do on the box during this process?
A) -1100 J B) -110 J C) -140 J D) -180 J E) 120 J
A plane mirror stands vertically on a table. A ruler lies on the table in such a position as to make an angle of 30° with the mirror. Determine the angle between the ruler and its image