2.70 An open tank has a vertical partition and on one side contains gasoline with a density p = 700 kg/m³ at a depth of 4 m, as shown in Fig. P2.70. A rectangular gate that is 4 m high and 2 m wide and hinged at one end is located in the partition. Water is slowly added to the empty side of the tank. At what depth, h, will the gate start to open? Water Stop. Partition 4 m Gasoline Hinge FIGURE P2.70