Question

A hollow sphere is made up of two materials.
First with K = 80 W/m-k is having ID of
15 cm and OD of 30 cm and second with
K= 20 W/m-k forms the outer layer with OD of
50 cm. The temperature of inside and outside
surfaces are 430°C and 100°C. The rate of heat
flow through the sphere is
(a) 6.67 kW
(b) 10.01 kW
(c) 15.14 kW
(d) 19.14 kW
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Answer 1

Answer:

D may be correct answer hope it may help you