4.21 A fluid with a density of 1040 kg/m3 density flows steadily through the rectangular box shown in the figure. The areas are A1 = 0:046 m2, A2 = 0:009 m2, and A3 = 0:056 m2, and the velocities are V1 =3im s andV2 =6jm s. Determine the net rate of momentum flux out of the control volume.

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A2 A3 A1 P4.21 -60