Example 2.2. Find the height of water column corresponding to a pressure of 54 kN/m.

2.78 An automobile has just dropped into a river. The car door is approximately a rectangle, measures 36 in. wide and 40 in. high, and hinges on a vertical side. The water level inside the car is up to the midheight of the door, and the air inside the car is at atmospheric pressure. Calculate the force required to open the door if the force is applied 24 in. from the hinge line. See Fig. P2.78. (The driver did not have the presence of mind to open the window to escape.) 36" -24" V 40 ■FIGURE P2.78

(b) A cone is placed in a water tank as shown in Figure Q3 (b). If the mass of the cone is 1.1 kg, and the tension in the cord connecting to the bottom of the tank is 24 N, determine the height of the cone that is below the water surface?

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