Question

At high altitudes the air pressure can drop quite noticeably. What is the net force on a 8.7x13 inch airplane window if at certain altitude the outside-cabin air pressure is Pout = 34 kPa and the inside-cabin pressure is supported at a level of Pin - 76.5 kPa? The net force on the window, Fnet - Units Select an answer If the same airplane window can withstand a twice as strong force as determined above, to what maximum value the inside-cabin pressure can be increased without breaking the windows (assume the same outside pressure as in the previous problem)? Compare your results to the standard atmospheric pressure: 1 atm - 101.33 kPa = 14.7 psi. The maximum inside pressure, Pmax Units Select an answer

Answer 1


③ Net pressure from inrêde P = Pin-Pout = 42.5 kPa and area of window = 8.7x13 inch? 2 = 8.7 X13X 0.0254 X0.0254 m = 0.073 m2

3 so Fuet = PxA = 42.5X10 Pa X 0.073 m2 Fnet = 3.1x103N 2 Now 6124103N F = 2 fuet 3 3 =85xlopa so, Pressure p = 6.2.10 0.073 ala Pin pt Pout = (85 +34) kPa = 119 kPa