Stokes’ law breaks down when the particle size is large because of (a) increased settling time and (b) for larger reynold number (0.2) turbulence sets in and viscosity does
not control settling.
find the maximum particle size for particle of a material (? m = 19,300 kg/m3) settling in a fluid (? = 1.85e-5 kg/m*s; ? f=1.2 kg/m3). what if water is the fluid (? =1.0e-3 kg/m*s; ? f=1000 kg/m3 ).

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

What happens when you slowly pulled the carboard?

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem