What am i doing wrong (water thru a tube question)

[mujadeo]

Homework Statement

A tube of radius 6.000 cm is connected to tube of radius 1.000 cm as shown above. (see attachment)..

Water is forced through the tube at a rate of 20.97 liters/min. The pressure in the 6 cm tube is 1.015×105 Pa. The density of water is 1000 kg/m3. Assume that the water is nonviscous and incompressible, and keep at least four digits in your computations.

(a) What is the velocity of the water in the 6 cm radius tube?
this is easy but i keep getting wrong answer --dont know why?

Homework Equations

The Attempt at a Solution

heres what i did
Im = v * A (that is, flow rate = velocvity times area)

so after conversions (20.97l/m /60 * 10^-3 = m^3) i have

Im = 3.495*10^-4m/s * .011 (pie*.06^2)
= 3.845*10^-6m/s

this is wrong.
Why?

please help... thanks!

 

[blochwave]

Well assuming your equations are right, your math is off

http://www.google.com/search?hl=en&...+liters+per+minute+/(+pi+*+(6+centimeters)^2)

remember, you won't have google calculator on a test, so make sure you figure out what you did wrong

 

[mujadeo]

well i didnt put brackets in right place.
should be
(20.97l/m /60) * 10^-3 = m^3)

=3.495*10^-4

still doesn't solve prob though.
any other help?? please help!??

 

[rl.bhat]

flow rate = velocvity times area
Hence velocity = flow rate/area