175. 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 heat transfer from the

ball.

A. 23.56 watts B. 32.77 watts

C. 9.22 watts D. 43.45 watts