(a) the weight of boeing aircraft is balanced by upward force due to the pressure difference.\\\\(\\Delta P\ imes A=3.3\ imes10^5\ imes g\\\\)where, \\\\(g=9.8 m/s^2\\\\)\\\\(\\Delta P=\\dfrac{3.3\ imes10^5\ imes9.8}{500}\\\\)\\\\(\\Delta P=6.46\ imes10^3\\ N/m^2\\\\)(b) The pressure difference between the lower and upper surface of the wing is \\\\(\\Delta P=\\dfrac{\\rho}{2}(v_2^2-v_1^2)\\\\)\\\\(v_2-v_1=\\dfrac{2\\Delta P}{\\rho(v_2+v_1)}\\\\)\\\\(v_{average}=\\dfrac{(v_2+v_1)}{2}=960\\ kmph\\\\)or, \\\\(v_{average}=\\dfrac{(v_2+v_1)}{2}=266.67\\ m/s\\\\)\\\\(v_2-v_1=\\dfrac{\\Delta P}{\\rho\ imes v_{average}}\\\\)\\\\(\\dfrac{v_2-v_1}{v_{average}}=\\dfrac{\\Delta P}{\\rho\ imes(v_{average})^2}\\\\)\\\\(\\dfrac{v_2-v_1}{v_{average}}=\\dfrac{6.46\ imes10^3}{1.2\ imes(266.67)^2}\\\\)\\\\(\\dfrac{v_2-v_1}{v_{average}}=0.075\\\\)