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1. a room measures 3m by 4.5m by 6m. The heating and air conditioning ducts to and from the room are cicular witha a diameter of 0.30m, and the air in the room is to be exchanged every 12 minutes. What is the necessary flow speed in the duct? (assume that the disity of the airs is constant)

2. A house has well-insulated walls. It contains a volume of 100 m^3 of air at 300K. Calculate the energy ot increase the temperature of this diatomic gas by 2 degrees C. Assume it is heating at a constant pressure and use Cp=7R/2.