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Question: Briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why:               (a)  Deformation by drawing             (b)  Annealing of an undeformed material

Which of the cross-sections below would experience the lowest engineering stress when the same load is applied? D A В 2 2 O1. C O II. A O II. D O IV. B

A very large slab of copper is initially at a temperature of 300◦C. The surface temperatureis suddenly lowered to 35◦C. What is the temperature at a depth of 7.5 cm4 min after the surface temperature is changed?

Problem 5: Questions Determine the capacitance in uF of a parallel plate capacitor having a plate area of 0.03 m and a plate separation of 0.2 um. The dielectric has a dielectric constant of 7. If the Capacitance is C-25mF, what is the distance between the two plates? Use same other values. Determine the inductance of a coil with 400 turns on a core that is 2 cm long and hasa diameter of 1 cm. The permeability (not the relative one) is 0.25 mH/m.

If the maximum force one bolt can withstand is 32505 lbf, how many bolts can be removed from the pressure vessel at the given conditions before the end cap blows off?

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

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Polymer PXX has a glass transition temperature of 49 degrees Celsius Describe the viscoelastic behavior of the polymer at room temper rather and at a temperature of 55 degrees Celsius

The distance term for a flat plate composite wall is del X. Is the distance term for a cylindrical pipe del r? ANS:______