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Problem 3a An engineer is using an experiment to characterize the power P consumed by a fan (see photo) to be used in an electronics cooling application. Power depends on four variables: P = f(p, D, Q, n), where p is the density of air, D is the diameter of the fan impeller, Q is the flow rate produced by the fan, and n is the rotation rate of the fan (rad per seconds). Using the step by step method, find the relevant a-groups. Show all steps clearly and use well organized table. No steps No credit.