An iron ball has a diameter of 6 cm and is 0.010 mm too large to pass

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An iron ball has a diameter of 6 cm and is 0.010 mm too large to pass through a hole in a brass plate when the ball and plate are at a temperature of 30 °C. At what temperature (the same for ball and plate) will the ball just pass through the hole? α = 1.2 × 10-5 °C-1 and 1.9 × 10-5 °C-1 for iron and brass, respectively.

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