In an apartment the interior air temperature is 20°c and exterior air temperatures is 5°c. the wall has inner and outer surface temperatures of 16°c and 6°c, respectively. the inner and outer convection heat transfer coefficients are 5 and 20 w/m2.k, respectively. calculate the heat flux from the interior air to the wall from the wall to the exterior air, and from the wall to the interior air. is the wall under steady-state conditions?

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

On a average work day more than work place firs are reorted

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.