Ad 1. At what rate (J/s) is heat lost through a 115 cm by 171 cm glass window pane that is 4.74 mm thick when the inside temperature is 24.3 .C and the outside temperature is - 13.9 .C. 2. A modern cabin has a concrete floor that is 3.72 inches thick. A roaring fire keeps the interior of the cabin at 20.9 C while the air temperature below the cabin is a chilly 1.97 C. How much heat (J) is lost through the concrete floor in 4.35 hrs if the cabin measures 3.17 m by 11.8 m? (1in = 0.0254m)(1hr = 60min) (1min = 60sec) 3. A spherical blackbody radiator with a diameter of 2.90 m is held at a constant temperature. What is the temperature (K) if the power radiated by the body is 18.9 kcal / min? (1 kcal = 1000 cal) (1cal = 4.186J) (1min = 60sec)( = 5.67*10-8 J/(s*m2K4))