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Problem 4. a) A circular copper ring at 20.0 oC has a whole with an area of 9.980 cm2 . What minimum temperature must it have so that it can be slipped onto a steel metal rod of cross-sectional area of 10.00 cm2 ? b)Suppose that the ring and the rod are heated simultaneously. What minimum change in temperature of both will allow the ring to be slipped onto the ring of the rod? (Assume no significant change in the coefficient of linear expansion over this temperature range)