A small disc-shaped earth satellite, 1m in diameter, circles the earth (radius 6250 km) at a distance of 300 km from the surfaces. The flat surface of the disc is oriented is tangential to the earth’s surface. The satellite surface has an emissivity of 0.3 and is at -18 ⁰C. One may assume that, i) The average earth surface temperature is 27⁰C and it’s a black body ii) The satellite is in the shadow of the earth.(as shown in Figure 1) iii) The part of the satellite surroundings not occupied by the earth is black and at 0K. The net heat rate at which energy is leaving the satellite is;
A small disc-shaped earth satellite, 1m in diameter, circles the earth (radius 6250 km) at a distance of 300 km from the surfaces. The flat surface of the disc is oriented is tangential to the earth’s surface. The satellite surface has an emissivity of 0.3 and is at -18 ⁰C. One may assume that, i) The average earth surface temperature is 27⁰C and it’s a black body ii) The satellite is in the shadow of the earth.(as shown in Figure 1) iii) The part of the satellite surroundings not occupied by the earth is black and at 0K. The net heat rate at which energy is leaving the satellite is;
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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A small disc-shaped earth satellite, 1m in diameter, circles the earth (radius 6250 km) at a
distance of 300 km from the surfaces. The flat surface of the disc is oriented is tangential
to the earth’s surface. The satellite surface has an emissivity of 0.3 and is at -18 ⁰C. One
may assume that,
i) The average earth surface temperature is 27⁰C and it’s a black body
ii) The satellite is in the shadow of the earth.(as shown in Figure 1)
iii) The part of the satellite surroundings not occupied by the earth is black and at 0K.
The net heat rate at which energy is leaving the satellite is;
a. 0 W
b. 1 W
c. 10.5 W
d. 14.5 W
Transcribed Image Text:Surroundings, 3
Satellite, 1
300 km
Earth, 2
1111
Sun rays
6250 km
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