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Answered 2014-02-10 12:24:04

1. The two objects are to be in thermal contact. This means that everything between the two objects must be a conductor.

2. There is to be a temperature difference between the two objects. One must be hotter than the other.

Given these two conditions, heat will pass from the hotter to the cooler object. That is one of the fundamental laws of thermodynamics.

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