Physics problems, really need help?

A

arnold

New member
I really don't understand how to do this question:

A particle in an eruption column is held in suspension by gas with a speed
of 30m per second, such that its total rise speed is 5m per second. The frictional force which the gas exerts on the particle is given by fF = 0.78*pi*r^2*u^2, where u is the
relative speed of the particle in the gas and r is its radius. The weight of the
particle is given by wp = (4/3)*pi*r^3*Ppg, where Pp = 2000 kg per cubic meter is the density of the particle. Determine its radius.

I have no clue how to do this, any help would be greatly appreciated
 
I had that same question. Its simply a matter of putting the radius up against the particile which is wp- 4./3. multiply to get the ratio even with the cubic meter then divide.
 
I had that same question. Its simply a matter of putting the radius up against the particile which is wp- 4./3. multiply to get the ratio even with the cubic meter then divide.
 
I had that same question. Its simply a matter of putting the radius up against the particile which is wp- 4./3. multiply to get the ratio even with the cubic meter then divide.
 
I had that same question. Its simply a matter of putting the radius up against the particile which is wp- 4./3. multiply to get the ratio even with the cubic meter then divide.
 
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