See first of all ∆P was not used with negative sign because value of it will be negative so to appreciate that negative value of ∆P I took minus out of it now ∆P becomes positive
Now as the rule of diffrentiation, derivative of v w.r.t r equating to 0 gives us value of r where it will be 0
Now to check whether that value of r is maximum or minimum we again diffrentiate v w.r.t r and check if it's value is positive or negative
If value is negative we call that at r here in this case r=O at the center of pipe we call it maximum velocity
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The velocity profile in a pipe is AP (1)A Show that the velocity is maximal at...
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