Fluids Mechanics - Determine algebraic formula for velocity

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Homework Statement

A block of weight W is being pulled over a table by another weight Wo, as shown in the figure.
Find an algebraic formula for the steady velocity U of the block if it slides on an oil film of
thickness h and viscosity μ. The block bottom area A is in contact with the oil. Neglect the cord weight and the pulley friction.

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Homework Equations

the shear stress τ=μ du/dy
the shear force F=τ*A

 

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1) If conveyor moving with a linear speed of 2.5 feet per second has a total weight of 1750 lb, the conveyor holds approximately __________ lb.ft of kinetic energy.

2) A Motor has a conveyor as a load, which has a total inertia of 122 lb.ft*. if the motor has a maximum torque capability of 78 lb.ft, the motor can reach its full speed od 1725 rpm in approximately _________ seconds.