zs A solid sphere ot redius 30 em is heated tosoo'C before beine pleced inside ofrefrigerator wkose temperatore is 5'e.If the sphere canis the power cadieted while iaside theref ngeretor?.rediete at z55%,what

radius of sphere r=30 cmA=4πr2A=4π×.32=1.1309 m2Th=500°CTh=500°+273=773 KTR=5°C+273=278 KQ=σATh4-TR4…

Answered: zs A solid sphere ot redius 30 em 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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zs A solid sphere ot redius 30 em is heated to
soo'C before beine pleced inside of
refrigerator wkose temperatore is 5'e.
If the sphere can
is the power cadieted while iaside the
ref ngeretor?.
rediete at z5
5%,
what

Expert Solution

Step 1 Given data

$radius of sphere r = 30 cm A = 4 {πr}^{2} A = 4 π \times {(. 3)}^{2} = 1.1309 m^{2} T_{h} = 500 ° C T_{h} = 500 ° + 273 = 773 K T_{R} = 5 ° C + 273 = 278 K Q = σA ({T_{h}}^{4} - {T_{R}}^{4}) where Stefan ’ s constant σ = 5.67 \times 10^{- 8} W / m^{2} K^{4}$

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