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A metal object is initially at a uniform temperature of 400°C.It is then exposed to an environment at 100°C.The Biot number of the system is 0.001.It takes 60 s for the object to cool down to 300°C.Calculate the additional time needed for the object to reach 200°C.

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A metal object is initially at a uniform temperature of 400°C.It is then exposed to an environment at 100°C.The Biot number of the system is 0.001.It takes 60 s for the object to cool down to 300°C.Calculate the additional time needed for the object to reach 200°C.





 
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