Consider a spherical 60 Watt glass light bulb surrounded by still air at 25 C. The bulb diameter is 6 cm. The bulb is located in a large room with a wall temperature of 20 C. The emissivity of glass is 0.6. Assume that the 60 W supplied to the bulb is transferred from the outside surface of the bulb by a combination of natural convection and radiation. (a) Calculate the surface temperature of the bulb. (b) Calculate the amount of heat transferred by radiation. (c) Calculate the amount of heat transferred by convection.