A) \[450cal\,s-1\]
B) \[231cals-1\]
C) \[439cal\,s-1\]
D) \[650cal\,s-1\]
Correct Answer: B
Solution :
[b]| Here, \[\operatorname{A}=1000c{{m}^{2}},x=0.4\operatorname{cm}\] |
| \[{{T}_{1}}-{{T}_{2}}=37-(-5)=42{}^\circ C\] |
| \[K=2.2\times {{10}^{-3}}cal\,{{s}^{-1}}c{{m}^{-1}}{{K}^{-1}}\] |
| Rate of loss of heat, \[=H=\frac{Q}{t}=\frac{KA\left( {{T}_{1}}-{{T}_{2}} \right)}{x}\]\[=\frac{2.2\times 1{{0}^{-3}}cal\,{{s}^{-1}}c{{m}^{-1}}{{K}^{-1}}\times 1000c{{m}^{-2}}\times 42}{0.4cm}\]\[=231cal{{s}^{-1}}\] |
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