An executive jet aircraft is in a rapid descent in a standard atmosphere. Its time rate of change of altitude (its climb rate) is - 15 ft/s.
(a) At the instant it passes through an altitude of 20,000 ft above sea level, what are the temperature, pressure, and density of the surrounding air?
(b) At the instant it passes through an altitude of 20,000 ft above sea level, what are the time rate of change of the temperature, pressure, and density of the surrounding air?