Consider a fluid (μ=0.4 cp) between two parallel plates spaced 0.009 ft apart. the lower plate is moving with a steady velocity of 1 ft/sec. what is the magnitude of the stress (pascals) acting on the upper plate? if the area of the lower plate is 1 m2 , what is the magnitude of the force required to pull the plate? in what direction does the momentum flux tensor point?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.