Posted by Angel on Friday, August 31, 2012 at 2:33pm.
I'm not sure how to approach this problem. The teacher wants volumetric flow rate (in cm).
A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin"(viscosity about water). If a pipe needs to deliver 6,000 m^3 of water a day, what diameter is required to satisfy the 1 m/s rule

Chemistry/Math  Steve, Friday, August 31, 2012 at 4:43pm
if the diameter is d meters, the crosssection of the pipe has area pi/4 d^2 m^2
In one second, at 1 m/s, then, pi/4 d^2 m^3/s of water will flow through the pipe
now just plug in the numbers:
6000m^3/day * 1day/86400s = pi/4 d^2 m^3/s
d = 1/3 √(5/2pi) = 0.297m
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