Which of the following is not an advantage of plastic over metal? Low thermal conductivity corrosion resistance comparatively low cost impact strength

An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range 8,000 - 20,000 20,000 - 32,000 32,000 - 44,000 44,000 - 56,000 56,000 -68,000 68,000 -80,000 80,000 - 92,000 Having a DP=763, which of the following common polymers is this sample? Xi 0.05 0.15 0.21 0.28 0.18 0.10 0.03 Wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 Select one: O a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol O b. Polystyrene with a monomer molecular weight of 104.15 g/mol Polycarbonate with a monomer molecular weight of 61.0168 g/mol O c. O d. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol Polypropylene with a monomer molecular weight of 42.08 g/mol O e.

Which of the statements below are accurate regarding the stress-strain behavior of polymers: (This question has more than one correct answer) а. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stress under constant strain rate b. As temperature is reduced, the necking behavior of plastic tensile bars completely disappears С. The slope of the stress-strain curve for totally elastic and brittle polymers is always positive d. The stress-strain curve for vulcanized elastomers has a greater slope than unvulcanized polymers throughout

In general, polymers have lower strength, hardness, stiffness, density, and temperature resistance compared to ceramics. T or F

Where Expressions from the linear theory of elasticity are in use?

What is referred to as being elastic perfectly plastic?

Which of the following statements is incorrect for polymers? (This question has only one correct answer) а. The fatigue behavior of polymers is more sensitive to loading frequency than for metals Ob. Amorphous and semi-crystalline polymers both have lower strength than crystalline polymers О с. Strength increases at higher temperatures as the material softens O d. It is desirable to have a ductile-to-brittle transition temperature below room temperature

The answer is one of the options below please solve carefully and circle the correct option Please write clear .