Asample of nitrogen at a pressure of 0.127 atm and a temperature of 81.5 k is compressed at constant temperature to a pressure of 42.6 atm. which of the following are true? choose all that apply the solid initially present will vaporize. the final state of the substance is a liquid. the sample is initially a solid. one or more phase changes will occur. the sample is initially a gas.

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)