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Question

The temperature of a body falls from $$40^oC$$ to $$36^oC$$ in 5 minutes. The temperature of the body will become $$32^oC$$ in


A
less than 10 minutes
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B
10 minutes
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C
more than 10 minutes
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D
None of these
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Solution

The correct option is B more than 10 minutes
We know that: $$\dfrac { d\theta  }{ dt } =\dfrac { { \theta  }_{ 1 }-{ \theta  }_{ 2 } }{ t } $$
So, $$\dfrac { 40-36 }{ 5 } =\dfrac { 32 }{ t } $$
Hence, $${t}={40}  \ {minute}$$ 
So, it will take more than 10 minute.

Physics

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