\(\int tan(x)dx
\\tan(x)=\frac{sin(x)}{cos(x)}
\\\Rightarrow \int tan(x)=\int \left ( \frac{sin(x)}{cos(x)} \right )dx\)
Let t=cos(x)
\(\\\Rightarrow\frac{dt}{dx} =\frac{d}{dx}cos(x)=-sin(x)
\\\Rightarrow dx=-sin(x)dt
\\= -\int \frac{1}{t}dt
\\=-ln\left | t \right |+C\)
On putting the value of ‘t’
\(\\=-ln\left | cos(x) \right |+C\)
Consider an airplane in an accelerated climb. At a given instant in this climb, the specific excess power is 120 ft/s
Consider an airplane flying at 620 mi/h at 35,000 ft. Calculate its energy height.
For a turbojet-powered airplane with the altitude variation of thrust given by Eq. (3.19), show that as the altitude increases, the maximum velocity decreases.
The BD-5J is equipped with plain flaps. The airfoil section at the wing root is an NACA 64-212, and interestingly enough, it has a thicker section at the tip, an NACA 64-218.
For the BD-5J, calculate (a) The maximum value of CL/CD (b) The maximum value of CL^(1/ 2) /CD
