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Two organic composites are made with the same matrix material, same size and concentration of unidirectional fiber reinforcements, and same interfacial properties between the fibers and the matrix. The spatial distribution of the fibers in the matrix, however, is different for the two cases. If crazing occurs in the polymeric matrix of the two composites, would you expect the monotonic and cyclic stress-strain response to be different for the two materials? Explain.
Air enters an adiabatic nozzle at 4MPa and 400 K with a velocit of 25 m/s. Air at the exit is 2 MPa and a velocity of 160 m/s. Calculate entropy? Is this a reversable process?
An electric power plant consumes 2.5 million gallons per day of cooling water. To control bacterial growth (slime), 2.0 mg/L of chlorine (measured as Cl2) is injected into the make-up water fed to the system.
A concrete box girder bridge has the rectangular x-section. The box is prismatic and considered thin-walled. It span is L=48m and simply supported at points A,B,C and D. The supports are assume to be able to transfer tensile forces.
A whip crack is illustrated below. To crack the whip, it is thrown forward with a velocity of 10 m/s and the handle is stopped in a vertical position instantly forming a tight loop that propagates forward.
Car A is traveling at a constant speed va= 130 km/h at a location where the speed limit is 100 km/h. The police officer in car P observes this speed via radar. At the moment when A passes P, the police car begines to accelerate at the constant rate o..
Determine the moment of inertia of the cone with respect to a vertical y axis that passes through the cone's center of mass. What is the moment of inertia about a parallel axis y' that passes through the diameter of the base of the cone? The cone ..
Determine the volumetric analysis of the mixture and the apparent gas constant.
The modulus of elasticity of an un-identified metal is known to be 3000 ksi. An engineer has to design a rod with a fixed diameter to carry a load, P, and wishes to keep the deformations in the rod to a minimum.
Which reactor requires the least Volume? Briefly explain why the PFR and CMFR volumes are different for achieving the same degree of pathogen reduction.
For a rubber component that, in its final form is to be vulcanized, should vulcanization be carried out prior or subsequent to the forming operation? Why?
A 12%, $50,000 bond is offered for sale at $45,000. If the bond interest is payable monthly and the bond matures in 20 years, what nominal effective rates of return per year will the purchaser make on the investment
A culvert is to be constructed in a bed of sand (e = 0.5) for drainage purposes. The foof of the culvert will be located 3 m below ground surface. Currently the groundwater level is at ground surface.
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