The cooling rate for three different materials is shown in the accompanying figure. The mathematical equation describing the cooling rate for each material is of the exponential form T(t ) = Tinitiale-at. In this relationship, T(t ) is the temperature of material at time t and the coefficient a represents the thermal capacity and resistance of the material. Determine the initial temperature and the a coefficient for each material. Which material cools the fastest, and what is the corresponding a value?
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