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# Urgent help needed ASAP! answering the Question below and can somebody explain the working out?

## Express Bernoulli equation in terms of (a) energy per unit mass (b) energy per unit volume, and (c) heads (m). What are the major assumptions used in the derivation of Bernoulli equation? The vertical distance (height) between the water surface in a header tank and the point where water is released by a pipe fed by the tank is "h" metre. In order to ensure that water flow through the pipe is quiet, the velocity should be less than 2 m/s. Using Bernoulli equation calculate the maximum value of h which will give a quiet flow. (In practice there are head losses expressed by engineers as a friction factor. The friction factor depends on Reynolds number. For a Reynolds number of about 80000, pipe internal diameter of 13.6mm, and overall pipe length of 10m, the head loss could be 3m, that is more than ten times the calculated value). A bath holds 120 Litres. It is to be filled in 5 minutes by a pipe with water flow velocity of 2m/s. Calculate the diameter and cross-sectional area of the pipe. Calculate the Reynolds number and state whether flow is laminar or turbulent

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