Question $1$ Compute the atmospheric pressure at elevation $20,000ft,$ considering the atmosphere

as a static fluid. Assume the standard atmosphere at sea level, and air temperature decreasing

linearly with elevation at the standard lapse rate of $0\mathrm{.}00356\frac{R}{f}t.($Using the Table A$\mathrm{.}3),$ the gas

constant slug $*R)$