it takes 10minutes to cool a liquid from 61C to 59C if room temperature is 30C then time taken in cooling from 51C to 49C.
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Explanation:
dQ/dt =k(θ−θ 0 )
θ0 is room temperature.
61−59/10
=k( 61+59/2 −30)........(1)
51−49/t =k( 51+49/2 −30).........(2)
Dividing equation 1 and 2 we get
t=15min
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