Question We will take the point 1 at the free surface of the tank and point 2 at the exit of the pipe. after this centerline is taken at the centerline of the orific where Z2=0. Positive direction of z is taken upwards

Fluid velocity at free surface is very low and almost Also the fluid at both the points is open to atmosphere so in that case  After putting the above mentioned conditions where Given

So from here the total head can be defined as  Since the dia of the piping system is constant and the initial velocity is given as 4 m/s so from here required mass flow rate and head can be calculated as    Answer

Now from equation 1 and 2   Answer

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