Labratory measurements show that when a certain material has a grain diameter of 2.33x10-2 mm it's yield strength is 107 MPa. When the material's grain diameter decreases to 1.84x10-2 mm it's yield strength increases to 117 MPa.
When the average grain diameter is increased to 3.28x10-2 mm...
The average grain diameter for a metal alloy was measured as a function of time at 650°C. The results are tabulated below:
Time Grain diameter
(min) (mm)
30 3.9 x 10-2
90 6.6 x 10-2
Predict what the grain diameter would be (in mm) after 199...