# hw4 - Chapter 7 LIFT(1 Problem 7.115 from White(take of air...

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Chapter 7: LIFT (1) Problem 7.115 from White (take ρ of air at 10 km to be = 0.4125 kg/m 3 ) (2) Problem 7.120 from White (hint: maximum lift-to-drag ratio occurs when d/dC L [L/D] = 0 Chapter 9: (3a) Show that the ratio of dynamic pressure (1/2 ρ V 2 ) to static pressure (p = ρ RT) at M=1 is k/2 (3b) Show that the ratio of kinetic energy per mass (1/2 V 2 ) to internal energy per mass (u = c v T) at M=1 is (1/2)k(k-1) (4) Given: Aircraft in flight with stagnation pressure at nose p 0 = 44.3 kPa (abs) and undisturbed p = 27.6 kPa (abs) and T = -50 o C. Find : a) Mach number b) Air speed of the aircraft Assumptions : (1) Air behaves as an ideal gas, k=1.4 (2) Constant specific heats (5)When a fixed mass of air is heated from 20 o C to 100 o C, please write down the equations for calculating; (a) change in enthalpy (b) change in entropy for a constant volume process (c) change in entropy for a constant pressure process (d) change in p for an isentropic process (e) change in ρ for an isentropic process

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## This note was uploaded on 04/26/2010 for the course MAE 101B 101B taught by Professor Rohr during the Summer '09 term at UCSD.

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hw4 - Chapter 7 LIFT(1 Problem 7.115 from White(take of air...

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