1. The problem statement, all variables and given/known data Calculate the magnitude of the net force on an air parcel of mass 1.0x10-3kg which is at a temperature 250K and which is in the US standard atmosphere at an altitude of 4.0km. Take the lapse rate as 6.5K/km and the surface temperature as 288K 2. Relevant equations Force = Mass x Acceleration Acceleration = Speed / Time 3. The attempt at a solution ?