Question: A 5-cm-diameter spherical ball whose surface is maintained at a temperature of 70C is suspended in the middle of a room at 20C. If the

A 5-cm-diameter spherical ball whose surface is maintained at a temperature of 70°C is suspended in the middle of a room at 20°C. If the convection heat transfer coefficient is 15 W/m2 • C and the emissivity of the surface is 0.8, determine the total rate of heat transfer from the ball.

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