Question

An airplane encounters widely spaced volcanic dust particles 1 micrometer in diameter with a specific weight of 28 kN/m3 at an altitude of 8 km. The average viscosity from the ground to that height may be assumed to be 1.7x10- Paesec, and the average air specific weight may be taken as 8.6 kN/m3. You estimate the time for the particles to reach the ground on a stll day to be about: 1000 days 100 days 10 days 1 day

Answer 1

URT vem data 3 3 ラー-1 2 8000 KN B00O VTS 2 025 七= 소d