Ahigh temperature muffle furnace uses a composite wall of three materials to manage heat transfer. inside the furnace, the air temperature is 800°c and the convection coefficient is 25 w/m2∙k. the inside surface temperature is 600°c. next, layer a has a thickness of 0.30 m and a conductivity of 20 w/m∙k. layer b has a thickness of 0.15 m. layer c has a thickness of 0.15 m and a conductivity of 50 w/m∙k. the outer surface temperature at steady state is 20°c. using an energy balance and a thermal circuit, determine the thermal conductivity of layer b.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?