Acomposite spherical tank made of three different materials in series with inside and outside convection. a)-draw the schematic of the system. b)-draw the thermal circuit for this system with all details. c)-formulate an expression for the heat transfer rate. d)-formulate an expression for the overall heat transfer coefficient based on ai. e)-formulate an expression for overall heat transfer coefficient based on a4 (outer area).

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

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.

Fluids at rest possess no flow energy. a)- true b)- false