A 1.27-cm diameter copper (r = 8933 kg/m3, c = 385 J/(kg °C)) sphere is heated in a convection furnace for a very long time so that its temperature becomes equal to the temperature of the air in the furnace at 260 °C. Then, the sphere is removed from the furnace and is placed in a forced convection flow where the heat transfer coefficient h is 17 W/(m2 °C) and where the temperature is 38 °C. The sphere is allowed to remain in the flow for 450 seconds at which time it is returned to the convection furnace. After 900 seconds in the furnace, the temperature of the sphere is 240.5 °C. What is the convective heat transfer coefficient in the convection furnace? 5 O 7.8 W/(m² °C) 15.5 W/(m² °C)

A 1.27-cm diameter copper (r = 8933 kg/m3, c = 385 J/(kg °C)) sphere is heated in a convection furnace for a very long time so that its temperature becomes equal to the temperature of the air in the furnace at 260 °C. Then, the sphere is removed from the furnace and is placed in a forced convection flow where the heat transfer coefficient h is 17 W/(m2 °C) and where the temperature is 38 °C. The sphere is allowed to remain in the flow for 450 seconds at which time it is returned to the convection furnace. After 900 seconds in the furnace, the temperature of the sphere is 240.5 °C. What is the convective heat transfer coefficient in the convection furnace? 5 O 7.8 W/(m² °C) 15.5 W/(m² °C)

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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Question

What’s the correct answer for this please ?

A 1.27-cm diameter copper (r= 8933
kg/m3, c = 385 J/(kg °C)) sphere is heated
in a convection furnace for a very long time
so that its temperature becomes equal to
the temperature of the air in the furnace at
260 °C. Then, the sphere is removed from
the furnace and is placed in a forced
convection flow where the heat transfer
coefficient h is 17 W/(m2 °C) and where
the temperature is 38 °C. The sphere is
allowed to remain in the flow for 450
seconds at which time it is returned to the
convection furnace. After 900 seconds in
the furnace, the temperature of the sphere
is 240.5 °C. What is the convective heat
transfer coefficient in the convection
furnace?
O 7.8 W/(m2 °C)
15.5 W/(m2 °C)

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