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A 3 cm thick slab aluminium (initially at 50C) is slapped tightly against a 5 cm slab of copper (initially at 20C). The out-sides are

A 3 cm thick slab aluminium (initially at 50°C) is slapped tightly against a 5 cm slab of copper (initially at 20°C). The out-sides are both insulated and the contact resistance is neglible. What is the initial interfacial temperature? Estimate how long the interface will keep its initial temperature.

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