Transmission Of Heat Question 189
Question: It takes 10 minutes to cool a liquid from 61oC to 59oC. If room temperature is 30oC then time taken in cooling from 51oC to 49oC is
[RPET 2003]
Options:
A) 10 min
B) 11 min
C) 13 min
D) 15 min
Show Answer
Answer:
Correct Answer: D
Solution:
In first case $ \frac{61-59}{10}=K[ \frac{61+59}{2}-30 ] $ ?.(i) In second case $ \frac{51-49}{10}=K[ \frac{51+49}{2}-30 ] $ ?.(ii) By solving $ t=15 $ min.
BETA
