Carbon diffuses in iron via an interstitial mechanism—for FCC iron from one octahedral site to an adjacent one. Two general sets of point coordinates for this site are 0 1/2 1 and 1/2 1/2 1/2 . Specify the family of crystallographic directions in which this diffusion of carbon in FCC iron takes place.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero