Consider an naca 2412 airfoil (the meaning of the number designations for standard naca airfoil shapes is discussed in chapter 4).
the following is a tabulation of the lift, drag, and moment coefficients about the quarter chord for this airfoil, as a function of angle of attack.

a (degrees) -2.0 2.0 4.0 c 0.05 0.25 0.44 0.64 0.85 1.08 1.26 1.43 1.56 cd 0.006 0.006 0.006 0.007 0.0075 0.0092 0.0115 0.0150 0.0186 cm. c/4 -0.042 -0.040 -0.038 -0.036 -0.036 -0.036 -0.034 -0.030 -0.025 6.0 8.0 10.0 12.0 14.0

(a) plot on graph paper the variation of xcp/c as a function of a.

(b) as angle of attack increase from -2 to 14 degree, where will the center of pressure approach?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false