A 9-cm-diameter spherical ball whose surface is maintained at a temperature of 1108C is suspended in the

Question:

A 9-cm-diameter spherical ball whose surface is maintained at a temperature of 1108C is suspended in the middle of a room at 208C. 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.