Question

A glass sheet of area 1m square has thickness 2mm It's opposite faces are at 35°c and 20°c respectively . If coefficient of thermal conductivity of glass is 0.2 cal/m°c sec , find the quantity of heat conducted half hour​

Answer 1

$\underline{\underline{\maltese\: \: \textbf{\textsf{Question}}}}$

$\sf\small\underline\red{Given:-}$

A glass sheet of area 1m square has thickness 2mm It's opposite faces are at 35°c and 20°c respectively . If coefficient of thermal conductivity of glass is 0.2 cal/m°c sec.

$\sf\small\underline\red{To \: find:-}$

find the quantity of heat conducted half hour.

$\underline{\underline{\maltese\: \: \textbf{\textsf{Solution}}}}$

K=0.2

A=10

θ1 = 40; θ2 = 20

t=1; 1=0.002

Heat flowing in the room per second will be

$\sf{Q=KA \frac{dT}{dx}}$

$\sf{Q= \frac{0.2×10×20×1}{0.002}}$

$\sf{Q=20000J}$

$\sf2× {10}^{4}  J \: \: is \: the \:answer.$