A thick, vertical iron pipe has an inner diameter of 0.065 meter. A thin aluminum disk, heated to a temperature of 85oC, has a diameter that is 3.9 x 10-5 meter greater than the pipe inner diameter. The disk is laid on top of the open upper end of the pipe, absolutely centered on it, and allowed to cool. Evaluate the temperature of the aluminum disk when the disk falls into the pipe? Neglect the temperature change of the pipe.