A convergent nozzle has an exit area of 1 in. Air enters the nozte with a stagnation pressure of 100 lbfjin2 and a stagnation temperat of 200 F. Determine the mass rate of flow for back presures of 30 1eljin 52.8 lbf/in.2, and 30 lbfin?

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)

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false