Question

A glass window is 8 mm thick and 1 m² wide. If the outside temperature is 30 ° C and at night 20 ° C and the thermal conductivity of the glass is 0.8 W / m ° C, then the amount of energy that passes through the glass for 1 hour is....​

Answer 1

The amount of energy that passes through the glass for 1 hour is 3,6 mega joule

EXPLANATION

Formula :

$\Large{\boxed{\sf{\frac{Q}{t} = kA \frac{\Delta T}{1} }}}$

$\Large{\boxed{\sf{E = \frac{Q}{t} \times t}}}$

$\:$

$\sf{\frac{Q}{t} = kA \frac{\Delta T}{1} }$

$\sf{\frac{Q}{t} = 0,8 \times 1 \times \frac{30 - 20}{0,008} }$

$\sf{\frac{Q}{t} = 1000 J/s }$

$\:$

$\sf{E = \frac{Q}{t} \times t}$

$\sf{E = 1000 \times 1 \: hour}$

$\sf{E = 1000 \times 3600 \: secon}$

$\sf{E = 3600000 \: J}$

$\sf{E = 3,6 \: mega \: Joule}$

$\:$

So, amount of energy that passes through the glass for 1 hour is 3,6 mega joule