please explain why and why? whether true or false and explain why to get credit.
ID: 2992172 • Letter: P
Question
please explain why and why? whether true or false and explain why to get credit.a. ____ When designing a part with FCC steels, beware of the possibility for brittle behavior at lower temperatures.
b. ____ The yield and ultimate strengths of metals and polymers generally increase with a decrease in temperature.
c. ____ An important mechanism of plastic deformation in thermoplastic polymers is dislocation motion.
d. ____ Alloys always have a specific melting point where during heating the alloy goes from solid to complete liquid at one temperature.
e. ____ The yield strength and ductility of a ceramic material are usually determined by doing a tensile test on a dog-bone shaped tensile specimen.
f. ____ Polymers can be strengthened by crystallization.
g. ____ Metals are weakened by increasing the concentration of dislocations.
h. ____ The melting temperature in a polymer is always lower than the glass transition temperature.
i. ____ Electrical resistivity is a geometry dependent material constant.
j. ____ Thermal conductivity is often proportional to electrical conductivity.
k. ____ In ferromagnetic materials, the Curie temperature is the temperature above which atom dipole moments become uncoordinated with neighbor atom dipoles, resulting in a loss of net magnetism in the material.
l. ____ Ceramics and polymers are transparent because the band gap between the valence and conduction bands is too large, so interaction with photons does not occur.
Explanation / Answer
a-t b-t c-f d-t e-f f-f g-t h-t i-f j-t k-f l-f
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