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calculatea the degree of polymerization if polytetrafluoroethylene see table 16-3 is 7500b if all of the polymer chains
1 what is the main reason why glass formation is easy in silicate systems2 can glasses be formed using metallic
1 an actuating lever in an electrical device must open and close almost instantly and carry a high current when closed
1 what typical density levels are obtained in sintered ceramics2 what do the terms lsquolsquoapparent porosity and
1 what are some of the typical characteristics of ceramic materials2 why is the tensile strength of ceramics much lower
a titanium 6246 alloy plate of a bimodal microstructure was found to have an edge crack of size 4 mm what will be the
1 explain the term lsquolsquothermosetting polymer why cant a thermosetting polymer be produced using just adipic acid
a polyethylene rope weighs 025 lb per foot if each chain contains 7000 repeat unitsa calculate the number of
1 we want to produce 10 lbs of a continuous unidirectional fiber-reinforced composite of hs carbon in a polyimide
1 what is a particulate composite2 what is a cermet what is the role of wc and co in a cermet3 calculate the density of
1 how much clay must be added to 10 kg of polyethylene to produce a low-cost composite having a modulus of elasticity
1 what is a fiber-reinforced composite2 what fiber-reinforcing materials are commonly used3 in a fiber-reinforced
1 explain briefly how the volume of fiber fiber orientation and fiber strength and modulus affect the properties of
500 kghr of steam drives turbine the steam enters the turbine at 44 atm and 450 c at a velocity of 60 msec and leaves
an airbus 310a with a mass of 140000 kg sits on a runway it takes off and flies to an altitude of 10500 m with a speed
from sabersky fluid mechanics give answer in blue book no collaboration happy thanksgiving the mass flow rate of the
standard atmospheric air to288k po101kpaabs is drawn steadily through a frictionless adiabatic converging nozzle into
calculate the flow rate of the cooling water giving answer in kg kg a surface condenser operating at a pressure of
1 concrete has exceptional strength in compression but it fails rather easily in tension explain why2 what controls the
1 why does the strength of ceramics vary considerably with the size of ceramic components2 explain the significance of
a three-point bend test is performed on a block of silicon carbide that is 10 cm long 15 cm wide and 06 cm thick and is
a thermosetting polymer containing glass beads is required to deflect 05 mm when a force of 500 n is applied the
a three-point bend test is performed on a block of zro2 that is 8 in long 050 in wide and 025 in thick and is resting
1 a 025-in-thick copper plate is to be cold worked 63 find the final thickness2 a 025-in-diameter copper bar is to be
1 define the following terms strain-hardening exponent n strain-rate sensitivity m and plastic strain ratio r use