Essentials Of Materials Science And Engineering
Essentials Of Materials Science And Engineering
4th Edition
ISBN: 9781337385497
Author: WRIGHT, Wendelin J.
Publisher: Cengage,
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Chapter 16, Problem 16.24P
Interpretation Introduction

Interpretation:

The factor which influence the crystallinity of the polymers are to be determined. Also, the development and role of crystallinity in PET and nylon is to be explained.

Concept Introduction:

Polymers are the large molecules which are made up of many small repeating units bonded together in linear, branched or cross-linked manner.

They are of two types: natural and synthetic. Natural polymers are those which occur naturally, and synthetic polymers are those which are synthesized or man-made.

Crystallization of polymers is the process where the molecular chains of the polymers tend to align themselves when temperature is reduced. Crystallization in polymers happens in segments and affects mechanical, optical and thermal properties of the polymer.

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Vehicles begin to arrive at an amusement park entrance at 8:00 A.M. at a rate of 1000veh/h. Some of these vehicles have electronic identifiers that allow them to enter the park immediately, beginning at 8:00 A.M., without stopping (they are billed remotely). All vehicles without such identifiers stop at a single processing booth, but they wait in line until it opens at 8:10 A.M. Once open, the operator processes vehicles at μ(t) = 8 + 0.5t [where μ(t) is in vehicles per minute and t is in minutes after 8:10 A.M.]. An observer notes that at 8:25 there are exactly 20 vehicles in the queue. What percent of arriving vehicles have electronic identifiers and what is the total delay (from the 8:00 A.M. until the queue clears) for those vehicles without the electronic identifiers (assume D/D/1 queuing)?
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