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The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 250 J/s. The energy is transferred a distance of 1.7 x 10-3 m through a body whose surface area is 1.8 m2. Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.

  • Physics -

    Q/t=q= k•A•ΔT/Δx
    ΔT=q•Δx/k•A =
    = 250•1.7•10⁻³/0.2•1.8=1.18 K

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