(5 points) The volume rate of flow, Q, through a pipe containing a slowly moving liquid is given by the equation Q=\frac{\pi R^{4} \Delta p}{8 \mu} where R is the pipe radius, Ap is the pressure drop along the pipe, µ is the viscosity and I is the length of the pipe. (a) What are the dimensions of the constant π/8? (b) Would this equation be valid if units other than feet and seconds were used?

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