A lead rod a 29x10-6 k-1 has a circular cross-section of, Ask an Expert

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A lead rod (a = 29x10-6 K-1) has a circular cross-section of 0.500 cm radius. The rod comes in a circular hole in a sheet of copper (a = 17x10-6 K-1) with a margin of 0.010 mm in its entire contour when both pieces are at 20°C.

a) At what temperature both pieces have zero margins?

b) Could this setting be possible with a lead sheet and a cooper rod? Why?

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