Transmission Of Heat Question 181
Question: The temperature of a liquid drops from $ 365K $ to 361 K in 2 minutes. Find the time during which temperature of the liquid drops from $ 344\ K $ to $ 342K $ . Temperature of room is $ 293\ K $
[RPET 1997]
Options:
A) 84 seconds
B) 72 seconds
C) 66 seconds
D) 60 seconds
Show Answer
Answer:
Correct Answer: A
Solution:
$ \frac{365-361}{2} $
$ =K[ \frac{365+361}{2}-293 ] $ = 70 K
Therefore $ K=\frac{1}{35} $ Again $ \frac{344-342}{t}=\frac{1}{35}[ \frac{344-342}{2}-293 ]=\frac{10}{7} $
Therefore $ t=\frac{14}{10} $ min = $ \frac{14}{10}\times 60=84 $ sec.
BETA
