a fire hydrant delivers water of density p at a volume rate L. the water travels vertically upward through the hydrant and then 900turn to emerge horizontally at speed V. the pipe and the nozzle have uniform cross section throughout . the force exerted by water at the corner ....???

The force exerted at corners by water is given by,                 F = ρ×L×awhere a is the acceleration.but   v2=2ah=2a×VAOR          a = v2 A2VTherefore      F = ρL×v2 A2Vwhere A is the area of crossection of the pipe.

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