The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka = 30 w/m·k and kc = 65 w/m·k, and known thickness, la = 0.35 m and lc = 0.25 m. the third material, b, which is sandwiched between materials a and c, is of known thickness, lb = 0.25 m, but unknown thermal conductivity kb. under steady-state operating conditions, measurements reveal an outer surface temperature (on outer surface of material c) of ts, o = 22◦c, an inner surface temperature (on inner surface of material a) of ts, i = 600◦c, and an oven temperature of t[infinity] = 800◦c. if the inside convection coefficient h = 25 w/m2 ·k, what is the value of kb?

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?