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.

your picture is not part of the scientific method.

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~courtney

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current