4-69. A student lives in a 4m x 6m X 6m dormitory and turns on his 150W fan before leaving the room in the morning on a summer day, expecting it to be cooler when he returns to the room. Assuming that all doors and windows are tightly closed, and without taking into account heat transfers through the walls and windows, determine the temperature in the room when the student returns 10h later. Use the specific heat values at room temperature and assume that the room conditions were 100kPa and 15C when he left Habitacin 4 mx 6 mx 6 m Ventilador 4-65E. Determine the internal energy change of air in a rigid container as its temperature is increased by transferring 50Btu/km of heat