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

  • Thread starter mujadeo
  • Start date
  • #1
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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!


Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #3
103
0
well i didnt put brackets in right place.
should be
(20.97l/m /60) * 10^-3 = m^3)

=3.495*10^-4

still doesnt solve prob though.
any other help?? please help!??
 
  • #4
rl.bhat
Homework Helper
4,433
8
flow rate = velocvity times area
Hence velocity = flow rate/area
 

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