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1. A parison is extruded from a die with outside diameter = 11.5 mm and inside diameter = 7.5 mm. The observed die swell is 1.25. The parison is used to blow mold a beverage container whose outside diameter = 112 mm (a standard size 2liter soda bottle). (a) What is the corresponding wall thickness of the container? (b) Obtain an empty 2liter plastic soda bottle and (carefully) cut it across the diameter. Using a micrometer, measure the wall thickness to compare with your answer in (a). Supplement to 13.23: (c) why would your measurement of the 2-liter bottle be “off” from your calculations? Be specific.
2. The bottom of a chair (where you sit, the ‘seat’) will be injection molded by itself in a mold. Assume the chair is a disk, 24 inches in diameter and 1/10 inch thick. If the injection pressure is 1600 psi, what is the minimum clamp tonnage you need for the injection molding machine? Give the answers in standard tons.
consider two reversible refrigerators operating in series. the first refrigerator removes heat at the rate of 250 kw
A metal has an atomic radius of 0.125 nm, an atomic weight of 58.69 g/mol and a density of 8.9 g/cm3. Determine whether it has a BCC or an FCC crystal structure
a magnesium-lead alloy of mass 5.5 kg consists of a solid phase that has a composition that is just slightly below the
a cylindrical fuel rod has a linear power rating of 467 wcm. the radius of the fuel is 1.3 cm. the gap thickness is
two block masses on smooth wheels m1 and m2 are connected to the wall through spring having a spring constant of k2
a diffuser for an incompressible inviscid fluid of density ? 1000 kgm3 consists of a diverging section of pipe. at the
Steam enters a nozzle at 4 MPa and 640°C with a velocity of 20 m/s. This process may be considered reversible and adiabatic. The nozzle exit pressure is 0.1 MPa. (a) Draw a sketch of this process. Include all known information. (b) What is the entro..
consider a well-insulated steam turbine. the inlet steam is at 5.0 mpa and 900oc. the exit pressure is at 200 kpa.
The Brayton cycle shown in figure 6.41 operates using CO2 as a working fluid with compressor and turbine isentropic efficiencies of 1.0. Calculate the thermal efficiency of this cycle when the working fluid is modeled.
Calculate the average square distance between the particles and plot its ratio to the time step . This is the diffusion/dispersion coefficient.
the load is supported by the four 304 stainless steel wires that are connected to the rigid members ab and dc.
a flame that produces 10kw of heat output is applied to one side of a 10cm by 10cm square of aluminum foil. the other
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