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1. Write an essay on polymeric materials that are used in the packaging of food products and drinks. Include a list of the general requisite characteristics of materials that are used for these applications. Now cite a specific material that is utilized for each of three different container types and the rationale for each choice.
2. Write an essay on the replacement of metal- lic automobile components by polymers and composite materials. Address the fol- lowing issues: (1) Which automotive com- ponents (e.g., crankshaft) now use polymers and/or composites? (2) Specifically what materials (e.g., high-density polyethylene) are now being used? (3) What are the rea- sons for these replacements?
a jet engine is a serial combination of a compressor an adiabatic constant pressure combustor and a turbine in that
determine the magnitude of the force p needed to start towing the 40-kg crate. also determine the location of the
If m = 5, as is typical of creep at the low temperatures used for stress relieving, σ o = 5000 psi, E = 10 × 106 psi, and C = 6 × 10-22(psi)-5/h at the annealing temperature, how long would it take for the stress to drop to 2500 psi?
Air enters a window air conditioner at 1 atm, 32C, 70% relative humidity at a rate of 2 m^3/min, and it leaves as saturated air at 15C. Part of the moisture in the air that condenses during the process is also removed at 15C. Determine the rates of h..
an ideal vapor-compression refrigeration cycle opperates at steady state with refrigeratn 134a as the working fluid.
If the trap door's weight is 50N. Calculate the tension in the string and the reaction at the hinge.
Determine the heat transfer coefficient and the heat transfer and condensation rates per unit length at a quality of X = 0.5. Plot the condensation rate per unit length over the range 0.2 X 0.8.
Consider a copper tube as a capped cylinder that cannot lengthen or shorten. If it were ?lled with water, what would be the circumferential strain in the wall when the water froze?
a robotic wheeled vehicle that contains science instruments is used to study the geology of mars. the rover weighs 408
Evaluate the reduction in pump BHP required by heating the oil from 50° F to 100° F. Suppose efficiency of 80% (HP)
a driver of a car is driving around in circles with a diameter of 100 ft. the driver is traveling 20 mpg when he
Assume a labor rate of $50.00/hr and a burden rate of $25/hr. Assume a surface speed of 2000 ft/min. The number of teeth on the cutter is 4. The feed is 0.005 in/tooth. The depth of cut is 0.020”. The width of cut is equal to the diameter of the t..
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