Dust particles of diameter 0.06 mm and density 1.6 g/cm3 are unsettled during high winds and rise to a height of 200 m by the time things calm down. Estimate how long it takes for the dust particles to fall back to the ground in still air at 1 atm and 30°C, and their velocity. Disregard the initial transient period during which the dust particles accelerate to their terminal velocity, and assume Stokes law to be applicable.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Dust particles of diameter 0.06 mm and density
1.6 g/cm3 are unsettled during high winds and rise to a height
of 200 m by the time things calm down. Estimate how long
it takes for the dust particles to fall back to the ground in
still air at 1 atm and 30°C, and their velocity. Disregard the
initial transient period during which the dust particles accelerate
to their terminal velocity, and assume Stokes law to be
applicable.
Trending now
This is a popular solution!
Step by step
Solved in 9 steps with 8 images
