A house has a composite wall made of wood, fiberglass insulation, and gypsum boards. On a cold winter day, the external and internal heat transfer coefficients are 60 and 30 W/m²°C, respectively. The total surface area is 350 m². (a) Determine the total heat loss through the wall: (b) if the wind were blowing strongly, increasing the external coefficient to 300 W/m²°C, determine the percentage increase in heat loss; (c) what is the thermal resistance determining the total heat flow through the wall?

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