Question
Download Solution PDFA body cools from 70°C to 40°C in 5 minute. Calculate the time it takes to cool from 50°C to 20°C, the temperature of the surroundings is 10°C.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Using Newton's Laws of cooling,
Rate of cooling,
Where Ti = initial temperature, Tf = final temperature, t is the time, and T0 = surrounding temperature.
Calculation:
Given Ti = 70oC, Tf = 40oC, t = 5mins
6 = K × 45
K = 6/45
Applying the law of cooling in the second condition
t = 9 minute
Hence the correct option is 9 minute
Last updated on Jun 19, 2025
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