A) \[180\ cal/\sec \]
B) \[40\ cal/\sec \]
C) \[30\ cal/\sec \]
D) \[20\ cal/\sec \]
Correct Answer: D
Solution :
Rate of loss of heat \[\left( \frac{\Delta Q}{t} \right)\propto \,\]temperature difference Dq \[\frac{{{\left( \frac{\Delta Q}{t} \right)}_{1}}}{{{\left( \frac{\Delta Q}{t} \right)}_{2}}}=\frac{\Delta {{\theta }_{2}}}{\Delta {{\theta }_{1}}}\] Þ \[\frac{60}{{{\left( \frac{\Delta Q}{t} \right)}_{2}}}=\frac{80-60}{40-20}\] Þ \[{{\left( \frac{\Delta Q}{t} \right)}_{2}}=\frac{20\,cal}{sec}\]
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