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A horizontal tube has different cross se...

A horizontal tube has different cross sections at points `A` and `B`. The areas of cross section are `a_(1)` and `a_(2)` respectively, and pressures at these points are `p_(1)=rhogh_(1)` and `p_(2)=rhogh_(2)` where `rho` is the density of liquid flowing in the tube and `h_(1)` and `h_(2)` are heights of liquid columns in vertical tubes connected at `A` and `B`. If `h_(1)-h_(2)=h`, then the flow rate of the liquid in the horizontal tube is

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