The tensile strength data for for two polymer samples are given below:

mn(g/mol) uts(mpa)
40,000 87
60,000 133
8 156
1 170

estimate the tensile strength
a) at mn of 76,000 g/mol and
b) mn of 129,000 g/mol.
can you use this method to determine the strength at mn of 400,000 g/mol? if not, why not?

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Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)