Vodafone AU 91 , 46111 41 % 111 1 :27 AM MasteringPhysics: Problem So… https://s

Question

Vodafone AU 91 , 46111 41 % 111 1 :27 AM MasteringPhysics: Problem So… https://session.masteringphysics.com Queeliun 3 Question 3 Part A Find the heat-loss rate through a slab of wood 2.2 thick, if one surface is at 30 c and the other at 10C Express your answer using two significant figures. Submit My Answers Give Up Part B Find the heat-loss rate through a slab of Styrofoam 2.2 ca, thick, if one surface is at 30%, and the other at 10 Express your answer using two significant figures. Submit My Answers Give Up Corntinua

Explanation / Answer

Q/A = K*dT/dx

where dT/dx is the thermal gradient , K = Thermal conductivity of the material

a) K for wood = 0.12 W/mK

Q/A = 0.12*(30-10)/0.022

= 109.1 W/m^2

b) K for styrofoam = 0.033 W/m K

Q/A = 0.033*(30-10) / 0.022

= 30 W/m2

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