Water flow 2

How many litres of water will flow in 7 minutes from a cylindrical pipe 1 cm in diameter, if the water flows at a speed of 30 km per hour

Correct result:

V =  274.8894 l

Solution:

t=7⋅ 60=420 s D=1/10=110=0.1 dm v=30/3.6⋅ 10=2503≐83.3333 dm/s  s=v⋅ t=83.3333⋅ 420=35000 dm r=D/2=0.1/2=120=0.05 dm S=π⋅ r2=3.1416⋅ 0.052≐0.0079 dm2  1 dm3=1 l V=s⋅ S=35000⋅ 0.0079=274.8894 l

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