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| PAGE: 331 | SET: Exercises | PROBLEM: 15 |
Newtons Law of Cooling is 
Here 
is the temperature of the object and 
is the surrondings temperature.
Change in temperature 
.
At the intital time 
and 
.
Substitute and in the equation .
.
The general equation is 
.
Substitute 
in the above equation.
After three minutes, the temperature is 
then
.
Hence 
.
substitute and in the above equation
.
Substitute 
in the equation at 
.
The equation is
Find the temperature after 
minutes.
The equation is 
.
.
Temperature after minutes :
Substitute 
and in the equation .
.
Temperature after minutes is 
.
The equation is
Find the temperature after 
minutes.
The equation is .
.
Temperature after minutes :
Substitute 
and in the equation .
.
Temperature after minutes is 
.
Temperature after minutes is and Temperature after minutes is .
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