If applicable, compute ζ, τ, ωn, and ωd for the following characteristic polynomials. If not applicable, state the reason why.
a. s2 + 4s + 40 = 0
b. s2 − 2s + 24 = 0
c. s2 + 20s + 100 = 0
d. s + 10 = 0

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false