An automobile has just dropped into a river. The car door is approximately a rectangle, measures \(36 \mathrm{in}\). wide and \(40 \mathrm{in}\). 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.)

Figure P2.78

Transcribed Image Text:

-36"- -24"- 40"