5. (25%) A frustum of a cone has its base heated as shown in Figure 2. The topsurface is held at 1200K while the side is perfectly insulated. Surfaces 1, 2, and 3are assumed gray and diffuse. What are the temperatures of surface 1 and 2? If theemissivity of surface 2 changes from 0,8 to 0.6, will the temperature of surface 2change to different value? The radius of upper circle is 1 m and the radius oflower circle is 3 m. The height of frustum is 4 m.Surface 3T= 1200K8 = 0.8Surface 1Surface 2q= 100W/m?8 = 0.6Perfectly insulatedɛ = 0.8

Answered: Surface 3 T= 1200K E = 0.8 %3D Surface…

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Surface 3 T= 1200K E = 0.8 %3D Surface 1 Surface 2 q= 100W/m? E = 0.6 Perfectly insulated E = 0.8

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.

Question

5. (25%) A frustum of a cone has its base heated as shown in Figure 2. The top
surface is held at 1200K while the side is perfectly insulated. Surfaces 1, 2, and 3
are assumed gray and diffuse. What are the temperatures of surface 1 and 2? If the
emissivity of surface 2 changes from 0,8 to 0.6, will the temperature of surface 2
change to different value? The radius of upper circle is 1 m and the radius of
lower circle is 3 m. The height of frustum is 4 m.
Surface 3
T= 1200K
8 = 0.8
Surface 1
Surface 2
q= 100W/m?
8 = 0.6
Perfectly insulated
ɛ = 0.8

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