Three large plates are separated bythin layers of ethylene glycol and water. The top plate moves to the right at 2m/s. At what speed and in what direction must the bottom plate be moved to hold the center plate stationary?

speed = 0.17m/s

Explanation:

For water at 20°c,

For ethylene glycol at 20°c,

Shear stress due to motion of the upper plates:

;

= u(v/b)

;

Therefore, for the middle plate to be stationery, the bottom plate must move to the left at a speed that produces equal oppostite force.

Therefore,

;

;

To find V we have

V= 0.17m/s

N.b: I believe you have the diagram

answer:

the answer is d

explanation:

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