1. Calculate the surface per unit volume in square centi- meters per cubic centimeter of galena having the screen analysis below. Use the method of extrapolation for -200 mesh, and assume that the two points between 100 and 200 mesh determine the straight line in a log-log plot. Specific gravity of galena = 7.43. Mesh 3 + 4 4 + G 6+8 8 + 10 10+14 14 + 20 20 + 28 28 + 35 35 + 48 48 + 65 65 +100 -100 +150 -150 +200 -200 - 1 - - - - - Percentage Retained 1.0 4.0 8.1 11.5 16.0 14.8 13.2 8.1 6.2 4.1 3.6 2.2 1.9 5.3

Calculate the viscosity of oxygen at 350 K and 1 atm pressure using equation 7.12 on page 90 of the text (also found in the PowerPoint slides).and compare with the value in Appendix I.

Calculate the reflection loss when a beam of radient energy passes an empty quartz cell assuming the refrative index of quartz is 1.55

5. The following table shows data from a flow study of a PS melt at 210°C in a capillary rheometer. a. Make a plot of log shear stress versus log shear rate. b. Calculate the value of the viscosity at 1 and 135 s', respectively. Shear Stress ,(10° dyn/cm') Shear Rate, 3.5 1.0 12.0 5.0 20.0 12.2 33.0 25.0 40.0 52.5 60.0 135.0 69.8 400.0