Consider the wing$-$body model in Prob$\mathrm{.}2.$ Assume that a horizontal tail with no

elevator is added to this model. The distance from the airplane's center of gravity to

the tail's aerodynamic center is $1$ m $.$ The area of the tail is $0\mathrm{.}4m^2,$ and the tail

setting angle is $2.$ The lift slope of the tail is $0\mathrm{.}12$ per degree. From experimental

measurement, ${}_0=0$ and $\frac{}{}=0\mathrm{.}42.$ If the absolute angle of attack of the model is

$5$ and the lift at this angle of attack is $4134$ N $,$ calculate the moment about the

center of gravity.