A solid stainless steel [G = 105 GPa] shaft that is 1.9 m long will be subjected to a pure torque of T = 65 N*m.
(a) Determine the minimum diameter d required if the shear stress must not exceed 47 MPa and the angle of twist must not exceed 3.7°. Report both the maximum shear stress Ï and the angle of twist Ï at this minimum diameter.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

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?

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length