Explain why very short fiber composites tend to be made with thermoplastic matrices while longer-fiber composites use thermoset matrices predominately

What will be an ideal response?


The very short fiber composites are made with thermoplastic matrices because of the low cost of manufacture if traditional thermoplastic manufacturing methods are used. Furthermore, the applications for these materials are generally well suited to the thermoplastic composites, with additional strength or stiffness by the fibers. On the other hand, composites with long fibers are made from thermoset because of the difficulty of wetting-out the fibers. The additional stiffness and higher temperature capabilities of thermosets also contribute to their use.

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Jennifer and Rex both receive a dividend from their 401(k) retirement plan every 6 months. The earning rates for this year have been 5% per year, compounded quarterly for Jennifer, and 4.85% per year, compounded monthly for Rex. Rex felt good about this because he knew the monthly com­pounding on his plan would make his APY higher than Jennifer’s APY.

(a) Is Rex correct? Explain your answer. (b) What is the effective rate for each plan on the basis of the payment period?

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Logic gates are __________ that are incorporated into the computer circuitry.

A. MOSFETs B. Diodes C. MOVs D. FETs

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To avoid turning the hermetic compressor shell into an exploding bomb, keep the system pressure below:

A) 300 psig. B) 200 psig. C) 150 psig. D) 250 psig.

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The most ethnically diverse region of colonial America was ____, whereas ____ was the least ethnically diverse.

A. New England, the South B. the middle colonies, the South C. the South, New England D. the middle colonies, New England E. the frontier regions, New England

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