3. a. A Styrofoam ice box has a total area of 0.950 m² and walls with an average thickness of 2.50 cm. The box contains beverages at 0°C. The inside of the box is kept cold by melting ice. How much ice melts in one day if the ice box is kept in the trunk of a car at 35.0°C? (Thermal conductivity of ice 0.010 J/s m °C, Latent heat of fusion is 3.33 x10³ J/kg) b. Suppose that a house has inside dimensions 12.0m×18.0m×3.00m, and that all air is replaced in 30.0 min. Calculate the heat transfer per unit time in watts needed to warm the incoming cold air by 10.0°C, thus replacing the heat transferred by convection alone. (density of air is 1.26 kg/m³ and specific heat of air is 1000 J/kg °C) c. What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room of ambient temperature 22.0°C. The person has a normal skin temperature of 33.0°C and a surface area of 1.50m². The emissivity of skin is 0.97 in the infrared, where the radiation takes place. Stephan Boltzmann constant 5.67 × 10-8 W/m².K4

3. a. A Styrofoam ice box has a total area of 0.950 m² and walls with an average thickness of 2.50 cm. The box contains beverages at 0°C. The inside of the box is kept cold by melting ice. How much ice melts in one day if the ice box is kept in the trunk of a car at 35.0°C? (Thermal conductivity of ice 0.010 J/s m °C, Latent heat of fusion is 3.33 x10³ J/kg) b. Suppose that a house has inside dimensions 12.0m×18.0m×3.00m, and that all air is replaced in 30.0 min. Calculate the heat transfer per unit time in watts needed to warm the incoming cold air by 10.0°C, thus replacing the heat transferred by convection alone. (density of air is 1.26 kg/m³ and specific heat of air is 1000 J/kg °C) c. What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room of ambient temperature 22.0°C. The person has a normal skin temperature of 33.0°C and a surface area of 1.50m². The emissivity of skin is 0.97 in the infrared, where the radiation takes place. Stephan Boltzmann constant 5.67 × 10-8 W/m².K4