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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
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Chapter 16 Solutions
Essentials Of Materials Science And Engineering
- Solve this problem and show all of the workarrow_forward1. For truss given in a figure below, determine reactions, and forces in all truss members. De- termine forces using two methods independently: (a) method of joints, and (b) method of sections. Compare your results and verify that your solutions are accurate. Assume that force F = 10kN. 2m 2m 2m ▼F ▼F 4m ▼F 4marrow_forward1) Determine if the existing sedimentation basins are sufficient to accommodate the projected future capacity. If not, design upgrades to the sedimentation basins. A) Current Capacity: 22.5 MGD B) Future Capacity: 34.5 MGD for 110,000 residents C) If not, design upgrades to the sedimentation basins. 2) Specify the design flow rate, the type of basin (circular vs. rectangular) 3) Specify the basin dimensions (length, width, water depth or diameter and water depth). 4) Specify the dimensions of the launders (if applicable) and the length of the weir.arrow_forward
- Please do not rely too much on chatgpt, because its answer may be wrong. Please consider it carefully and give your own answer. You can borrow ideas from gpt, but please do not believe its answer.Very very grateful! Please do not copy other's work,i will be very very grateful!!Please do not copy other's work,i will be very very grateful!!arrow_forwardThe capacity of a freeway lane with free-flow speed of 70mph and jam density average vehicle spacing 40ft assuming greenshields’s model applies. Please explain step by step and show formulaarrow_forward= The frame shown is fitted with three 50 cm diameter frictionless pulleys. A force of F = 630 N is applied to the rope at an angle ◊ 43°. Member ABCD is attached to the wall by a fixed support at A. Find the forces indicated below. Note: The rope is tangent to the pully (D) and not secured at the 3 o'clock position. a b •C *су G E e d BY NC SA 2013 Michael Swanbom Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value a 81 cm b 50 cm с 59 cm d 155 cm For all answers, take x as positive to the right and positive upward. At point A, the fixed support exerts a force of: A = + ĴN and a reaction couple of: →> ΜΑ Member CG is in Select an answer magnitude У as k N-m. and carries a force of N.arrow_forward
- The lower jaw AB [Purple 1] and the upper jaw-handle AD [Yellow 2] exert vertical clamping forces on the object at R. The hand squeezes the upper jaw-handle AD [2] and the lower handle BC [Orane 4] with forces F. (Member CD [Red 3] acts as if it is pinned at D, but, in a real vise-grips, its position is actually adjustable.) The clamping force, R, depends on the geometry and on the squeezing force F applied to the handles. Determine the proportionality between the clamping force, R, and the squeezing force F for the dimensions given. d3 d4 R 1 B d1 2 d2 D... d5 F 4 F Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value d1 65 mm d2 156 mm d3 50 mm 45 d4 d5 113 mm 30 mm R = Farrow_forwardA triangular distributed load of max intensity w =460 N/m acts on beam AB. The beam is supported by a pin at A and member CD, which is connected by pins at C and D respectively. Determine the reaction forces at A and C. Enter your answers in Cartesian components. Assume the masses of both beam AB and member CD are negligible. cc 040 BY NC SA 2016 Eric Davishahl W A C D -a- B Ул -b- x Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value α 5.4 m b 8.64 m C 3.24 m The reaction at A is A = i+ ĴN. λ = i+ Ĵ N. The reaction at C is C =arrow_forward3. For problems given below, determine all the reaction forces and plot force diagrams for normal forces (N), shear force (T), and moments (M). 150 lb/ft 10 ft C B 2 ft 2 ft -4 ft D 250 lb/ft 50 lb/ft B 150 lb-ft 150 lb-ft -20 ft 10 ft -20 ft 200 lb-ftarrow_forward
- Please answer 1, 2 and 3 on the endarrow_forward56 Clamps like the one shown are commonly used in woodworking applications. This clamp has the dimensions given in the table below the figure, and its jaws are mm thick (in the direction perpendicular to the plane of the picture). a.) The screws of the clamp are adjusted so that there is a uniform pressure of P = 150 kPa being applied to the workpieces by the jaws. Determine the force carried in each screw. Hint: the uniform pressure can be modeled in 2-D as a uniform distributed load with intensity w = Pt (units of N/m) acting over the length of contact between the jaw and the workpiece. b.) Determine the minimum vertical force (parallel to the jaws) required to pull either one of the workpieces out of the clamp jaws. Use a coefficient of static friction between all contacting surfaces of μs = 0.56 and the same clamping pressure given for part (a). 2013 Michael Swanbom A B C a Values for dimensions on the figure are given in the following table. Note the figure may not be to scale.…arrow_forwardDetermine the force in each member of the space truss given F=5 kN. Use positive to indicate tension and negative to indicate compression. F E Z -2 m. B 3 m C 5 m 3 m A -4 m. AB = KN FAC = FAD = KN KN KN FBC = KN FBD FBE = = KN Farrow_forward
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