A glass window pane and a pyrex window pane are held together as shown below. Heat is flowing through the combination from the hot side to the cold side. The temperatures of the hot surface and the cold surface are shown, with the temperature of the surface between them. The glass pane has a thickness of 3.00 mm. Find the thickness of the pyrex pane. (The cross-sectional areas are not needed.) Thermal conductivity of glass kglass = 0.800 J/s m-Co Thermal conductivity of pyrex: kpyrex = 1.15 J/s•m•C°

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A glass window pane and a pyrex window pane are held together as shown below.
Heat is flowing through the combination from the hot side to the cold side. The
temperatures of the hot surface and the cold surface are shown, with the temperature
of the surface between them. The glass pane has a thickness of 3.00 mm. Find the
thickness of the pyrex pane. (The cross-sectional areas are not needed.)
Thermal conductivity of glass kglass = 0.800 J/s-m-C°
Thermal conductivity of pyrex: kpyrex = 1.15 J/s-m-C°
pyrex
glass
heat
heat
3.00 mm
T, = 38 °c
T3 = 20° c
%3D
T2 = 23.4°C
Transcribed Image Text:A glass window pane and a pyrex window pane are held together as shown below. Heat is flowing through the combination from the hot side to the cold side. The temperatures of the hot surface and the cold surface are shown, with the temperature of the surface between them. The glass pane has a thickness of 3.00 mm. Find the thickness of the pyrex pane. (The cross-sectional areas are not needed.) Thermal conductivity of glass kglass = 0.800 J/s-m-C° Thermal conductivity of pyrex: kpyrex = 1.15 J/s-m-C° pyrex glass heat heat 3.00 mm T, = 38 °c T3 = 20° c %3D T2 = 23.4°C
Two iron spheres with the same radius look identical from the outside, but one has a
hollow cavity on the inside (see below). They are both heated to a temperature of 350°
C and suspended by a thin cord from the ceiling of a vacuum chamber. The only way
they can lose heat is by radiation. (a) Which sphere, if either, will radiate more watts
of power? Explain your answer (b) Which sphere, if either, will cool down the fastest?
Explain your answer.
a
b
interior view
Transcribed Image Text:Two iron spheres with the same radius look identical from the outside, but one has a hollow cavity on the inside (see below). They are both heated to a temperature of 350° C and suspended by a thin cord from the ceiling of a vacuum chamber. The only way they can lose heat is by radiation. (a) Which sphere, if either, will radiate more watts of power? Explain your answer (b) Which sphere, if either, will cool down the fastest? Explain your answer. a b interior view
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