Ahuman subject with mass 96 kg, body specific heat 3500 jkg^-1k^-1 skin temperature 34.5 degrees celsius, surface area 1.5m^2 and emissivity 0.7 enters a room whose walls are at temperature 21 degrees celsius. at what rate does body temperature decrease? answer in degrees per hour, as a positive number

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?