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## Homework Statement

Attached.

I am working on part (i). What is the resistive force?

Shear stress= μ*(du/dy) = μU/l = F/A

Since the force is up and down, it causes a shear stress, thus area is parallel to the force and thus it is the 4 faces B*L

Thus, A=4*B*L

→ F=μ*U*A/l = 4*μ*U*L*B/l

Where = viscosity

l=clearance gap

L=length of block

F=Resistive force

A=Area

I'm not sure if that is the correct method. Can someone please verify?