The average grain diameter for a brass material was measured as a function of time at 650°C, which is shown in the following table at two different times:
Time (min) Grain Diameter (mm)
30 3.9 × 10–2
90 6.6 × 10–2
(a) What was the original grain diameter?
(b) What grain diameter would you predict after 150 min at 650°C?
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