An incompressible fluid flows between two flat plates, driven by a constant pressure gradient, dP/dx, and the constant motion of one of the plates, with speed, U. The spacing between the plates is b and the viscosity of the fluid is u. Define a coordinate system where -b/2

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.