Two rods, one made of silver and the other made of lead, have the same length of 40.0 cm when measured at 5.0 oC. They are placed end to end, touching each other with one end of the silver rod fixed to the wall. Then they are heated from 5.0 oC to 100.0 oC. How far does the end of the lead rod move? The coefficient of linear expansion of silver is 18 x 10-6 1/oC, and that of lead is 29 x 10-6 1/oC

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