A) 472 sec
B) 693 sec
C) 912 sec
D) 1101 sec
Correct Answer: A
Solution :
[a] By the law of conservation of energy, energy given by heater must be equal to the sum of energy gained by water and energy lost from the lid. \[\operatorname{Pt}=ms\Delta \theta + energy lost\] \[2000t=3\times 4.2\times {{10}^{3}}\times \left( 97-27 \right)+130t\] \[\Rightarrow t=472sec\]You need to login to perform this action.
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