The human body transports heat from the interior tissues, at temperature `37.0^(@)C`, to the skin surface, at temperature `27.0^(@)C`, at a rate of 100 W. If the skin area is `1.5 m^(2)` and its thickness is 3.0 mm, what is the effective thermal conductivity, k, of skin?

What is the heat lost from the body of a person her hour whose body temperature is 37^(@) C and the surrounding temperature is 20^(@) C ? The emissivity of the skin is 0.92 and the surface area of skin is 1.6 m^(2) . (Asssume that the person is unclothed.)

A sphere of radius 0.350m, temperature 27.0^(@)C , and emissivity 0.850 is located in an environment of temperature 77.0^(@)C . At what rate does the sphere (a) emit and (b) absorb thermal radiation ? (c ) What is the sphere's net change in energy in 3.50 min ?

A man, the surface area of whose skin is 2m^(2) , is sitting in a room where air temperature is 20^(@)C if his skin temperature is 28^(@)C and emissivity of his skin equals 0.97, find the rate at which his body loses heat.

A man, the surface area of whose skin is 2m^(2) , is sitting in a room where air temperature is 20^(@)C if his skin temperature is 28^(@)C and emissivity of his skin equals 0.97, find the rate at which his body loses heat.

(a) Calculate the rate at which body heat is conducted through the clothing of a skier in a steady-state process, given the following data : the body surface area is 1.8m^(2) , and the clothing is 1.0 cm thick , the skin surface temperature is 33^(@)C and the outer surface of the clothing is at 1.0^(@)C , the thermal conductivity of the clothing is 0.040 W//m . K. (b) If , after a fall, the skier's clothes became soaked with water of thermal conductivity 0.60 W//m.K , by how much is the rate of conduction multiplied ?

A carpenter builds an outer house wall with a layer of wood 2.0 cm thick on the outside and a layer of an insulation 3.5 cm thick as the inside wall surface. The wood has K = 0.08 W//m-K and the insulation has K = 0.01 W//m-K . The interior surface temperature is 19^@C and the exterior surface temperature is -10^@C . (a) What is the temperature at the plane where the wood meets the insulation? (b) What is the rate of heat flow per square metre through this wall ?

A carpenter builds an outer house wall with a layer of wood 2.0 cm thick on the outside and a layer of an insulation 3.5 cm thick as the inside wall surface. The wood has K = 0.08 W//m.K and the insulation has K = 0.01 W//m.K . The interior surface temperature is 19^@C and the exterior surface temperature is -10^@C . (a) What is the temperature at the plane where the wood meets the insulation? (b) What is the rate of heat flow per square metre through this wall ?