Question
Physics, Third Edition, James S.Walker Chapter 15, Question56 Suppose the air outside the windowof an aircraft moves at a speed of approximately 170 m/s shortlyafter takeoff, and the air inside the plane is atmosphericpressure. A. What is the pressuredifference? B. If the window is 25 cm by42 cm, what is the force exterted on the window by airpressure? Is Bernoulli's Equation used tofind both answers? Physics, Third Edition, James S.Walker Chapter 15, Question56 Suppose the air outside the windowof an aircraft moves at a speed of approximately 170 m/s shortlyafter takeoff, and the air inside the plane is atmosphericpressure. A. What is the pressuredifference? B. If the window is 25 cm by42 cm, what is the force exterted on the window by airpressure? Is Bernoulli's Equation used tofind both answers?
Explanation / Answer
From bernoulli's equation pressure difference dP =( 1/ 2) v ^ 2 where = density of air = 1.28 kg / m ^ 3 v =speed = 170 m / s substitue values weget dP = 18496 Pa (B). Area A = 25 cm * 42 cm = 1050 cm ^ 2 = 0.105 m ^ 2 So. force exerted on the window F = dP * A = 1942.08 N