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Question 1: At 20C, a spherical steel ball has diameter 1.001cm and sits on a 1.000cm wide circular hole in a copper plate, not quite

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Question 1: At 20C, a spherical steel ball has diameter 1.001cm and sits on a 1.000cm wide circular hole in a copper plate, not quite fitting through. If the ball and plate are heated together, at roughly what temperature will the ball fall through the plate? (asteel = 1.2 x 10'5 K"1 and acopper = 1.7 x 10'5 K4)

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