During the isothermal heat rejection process of a carnot cycle, the working fluid experiences an entropy change of -0.7 btu/r. if the temperature of the heat sink is 95 of, determine a) the amount of heat transfer b) the entropy change of the sink c) the total entropy change for this process, considering that for the system and that for the sink.

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)