that is said to have toughness is able to er nd slow moving forces for extended
ID: 1767266 • Letter: T
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that is said to have toughness is able to er nd slow moving forces for extended periods of time at elevated temperatures mer sorb relatively large amounts of energy without rupture Leap tall buildings with a single bound ea for a basketball hoop support pole that they would like A company has approached you with an id s o make from plastic. Select two of the most important mechanical aspects of this new part that of plastics, b) impact resistance of both the part and the polymer chosen, c) the rs. ITa highly polar plastic like Polyvinylalcohol is placed into a polar solvent like water, the plastie most tic. Select two noed to be considered from the list below? dexural strength of the material d) the torsional strength of material. nature a) creep a Swell or soften b. Do nothing c. React d. Dissolve 20. Polyvinylchloride (PVC) is used in industrial applications as a rigid material but is also used in many consumer applications as a soft pliable material called vinyl. The main difference between these two applications is based around the use of a. Fillers b. Plasticizers c. Colorants d. Modified polymerization methods When surface cracks develop due to exposure to environmental chemical embrittlement this is generally called 21. a. Blushing b. Crazing c. Oxidization d. Charring 22. There are also some polymers that, instead of having a carbon backbone, have a silicon or phosphorous backbone and these are considered inorganie polymers. a) False b) True 23. Wool, cotton, linen, hair, skin, nails, rubber, and flesh are all naturally occurring polymers a) False b) True Which these is Thermoplastic 24Explanation / Answer
17) Best answer is b. Because toughness is the property of material to absorb the shock energy without rapture.
18) Best answer is 'b' and 'c' because for football hoop support pole should withstand the fatigue load of football. Impact of football should be resistant by this hoop support. Due to impact load impact resistant property is more important. And flexural rigidity is also important at impact load, because by the theorem of Macaulay's theorem of slope and deflection of beam Flexural rigidity is inversely proportional to deflection of beam.
19) Best answer is 'd'. It is dissolved into water if it is stirred at least 5-6 hours. It can be made more thick if it is heated to 45-60°C.
20) PVC is rigid material but vinyl is used as soft playable material due to addition of phthalates which is one type of plasticizer makes it flexible. So best answer is'b'.
21) best answer is 'b'. Crazing is nothing but cracking network common phenomena in thermoplastic materials due to environmental chemical embrittlement.
22) True. Given Defination of inorganic polymer is correct.
23) True. Naturally occurring polymers are generally water based.
24) First figure is of thermoplastic because it is having no chemical bonding and due to which it can soften and harden again and again.
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