The 25-cm diameter ram in a hydraulic lift slides in a 25.015-cm diameter cylinder. The viscosity of the oil filling the gap is 0.04 N⋅s/m2. If the speed of the ram is 15 cm/s, determine the frictional resistance force when a 3 m length of the ram is engaged in the cylinder. The answer provided is Fshear ressistance = 188N I just can not seem to figure this out please help.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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The 25-cm diameter ram in a hydraulic lift slides in a 25.015-cm diameter cylinder. The viscosity of the oil filling the gap is 0.04 N⋅s/m2. If the speed of the ram is 15 cm/s, determine the frictional resistance force when a 3 m length of the ram is engaged in the cylinder.

The answer provided is Fshear ressistance = 188N I just can not seem to figure this out please help.

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