Integrals/Related Rates(?)/Volume
posted by Alex .
Fluid is flowing in a tube that has a radius of 3 centimeters. Water is flowing through a circular cross section at a rate of (9r^2) cm/s, where r is the distance from the center of the cross section. What is the total amount of water that flows through the cross section in 4 seconds?

ok, to get the flow, you integrate area*flow rate through that area.
so dArea= dr*2PI
dVolume= flowrate*dArea
Volume= INT 9r^2*2PI*dr=18PI r^3/3 from r=0 to r=3
volumeflowrate= 6PI *27 cm^3/sec
total amount H2O: volumeflowrate*time 
through every ring of radius r and thickness dr and amount per second flows equal to 2 pi r v dr
or
dq = 2 pi (9 r  r^3) dr
integrate that from 0 to 3 and then multiply by 4 seconds
18 pi (r^2/2)  2 pi (r^4/4)
9 pi (9)  (pi/2)(81)