a body takes 4 minutes to cool from 100 to 70 degree Celsius. to cool from 70 to 40 degree Celsius it will take how much time. room temperature is 15 degree Celsius
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Answer:
The Newtons law of cooling formula is given by:
T(t)=T
s
+(T
o
−T
s
)e
−kt
T
o
−T
s
T(t)−T
s
=e
−kt
−kt=ln
T
o
−T
s
T(t)−T
s
−kt=ln
100−15
70−15
Thus we get k=0.10883
Now for the second interval we get:
−kt=ln
70−15
40−15
Thus, t=7 mins
Explanation:
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