Question

Determine the net heat transfer through the black body disc with radius 4cm and mass 9g, at 320C when transferred to a surrounding temperature of 650C.

Answer 1

Answer

the net heat transfer through the black body disc is given by

$\frac{dQ_{in}}{dt}=mc\frac{dT}{dt}$

So heat transffer per unit second

$dQ=mc\space dT$

Using given data

$dQ=0.009\times0.385\times(330+273) \\=2.09J$