The extrusion die for a polyethylene parison used in blow molding has a mean diameter of 20.0 mm. the size of the ring opening in the die 2.0 mm. the mean diameter of the parison is observed to swell to a size of 23.0 mm after exiting the die orifice. if the diameter of the blow-molded container = 125 mm, determine: (a) the corresponding wall thickness of the final container, (b) the inside diameter of the parison.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false