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4 years ago

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how much heat flows per second through a well lagged bar of alummium of thermal cond7ctivity 230W ,the bar has length of 300mm a

nd a cross sectional area of 100 mm² with a temorature difference of 40°c between the ends of the bar

1 answer:

Mars2501 [29]4 years ago

6 0

Answer:

The amount of heat flows per second in given aluminium bar is 3.066 $JS^{-1}$ .

Explanation:

We know that , amount of heat flowing per second is given by

$\frac{\mathrm{d} Q}{\mathrm{d} t} = \frac{KA\Delta T}{L}$

Where A = area = $300 mm^{2} = 300\times 10^{-6} m^{2}$

$\Delta T = 40^{o} c = 40 K$

K = Thermal conductivity = $230 W/m-k$

L = Length = $300mm = 300 \times 10^{-3}$

Upon substituting these values in above equation we get ,

Heat flowing per second = $3.066 JS^{-1}$

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