# E-PolyLearning

 26. An 8 cm diameter orange, approximately spherical in shape, undergoes ripening process and generates 18000 k J/m³ hr of energy. If external surface of the orange is at 6.5 degree Celsius, find out the temperature at the center of the orange. Take thermal conductivity = 0.8 k J/ m hr degree for the orange material a. 13.5 degree Celsius b. 12.5 degree Celsius c. 11.5 degree Celsius d. 10.5 degree Celsius

 27. A solid sphere of 8 cm radius has a uniform heat generation of 4000000 W/m³. The outside surface is exposed to a fluid at 150 degree Celsius with convective heat transfer coefficient of 750 W/m² K. If thermal conductivity of the solid material is 30 W/m K, determine maximum temperature a. 444.45 degree Celsius b. 434.45 degree Celsius c. 424.45 degree Celsius d. 414.45 degree Celsius