Determing speed of water


by Beastegargoyl
Tags: determing, speed, water
Beastegargoyl
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#1
Nov29-09, 11:31 AM
P: 9
1. The problem statement, all variables and given/known data
River Pascal with a volume flow rate of 4.7105 joins with River Archimedes, which carries 1.1106 , to form the Bernoulli River. The Bernoulli River is 130 wide and 30 deep.

What is the speed of the water in the Bernoulli River?
2. Relevant equations
Express your answer using two significant figures.


3. The attempt at a solution
I attempted to guesses so far.
0.120 m/s was wrong
1.20 m/s was wrong



Thanks for all the help.
Jared
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tiny-tim
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#2
Nov29-09, 03:39 PM
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Hi Jared! Welcome to PF!

(try using the X2 tag just above the Reply box )
Quote Quote by Beastegargoyl View Post
River Pascal with a volume flow rate of 4.7105 joins with River Archimedes, which carries 1.1106 , to form the Bernoulli River. The Bernoulli River is 130 wide and 30 deep.

What is the speed of the water in the Bernoulli River?

I attempted to guesses so far.
0.120 m/s was wrong
1.20 m/s was wrong
Show us your full calculations, and then we can see what went wrong, and we'll know to help!
Beastegargoyl
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#3
Nov29-09, 06:30 PM
P: 9
For vfr=4.7*105L/s

I used the equation 4.7*105/3900 equals 1.2m/s

Thanks for the help.
Jared

tiny-tim
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#4
Nov30-09, 02:55 AM
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Determing speed of water


Hi Jared!

(just got up )
Quote Quote by Beastegargoyl View Post
River Pascal with a volume flow rate of 4.7105 joins with River Archimedes, which carries 1.1106 , to form the Bernoulli River. The Bernoulli River is 130 wide and 30 deep.

What is the speed of the water in the Bernoulli River?
Quote Quote by Beastegargoyl View Post
For vfr=4.7*105L/s

I used the equation 4.7*105/3900 equals 1.2m/s
oh i see you only used the volume flow rate of River Pascal.

The Bernoulli River contains the water of both River Pascal and River Archimedes.
Beastegargoyl
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#5
Nov30-09, 01:19 PM
P: 9
@tiny-tim- Did you come up with an answer of .40m/s where that incportates both rivers?

Thanks for your help,

Jared
tiny-tim
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Nov30-09, 01:56 PM
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Quote Quote by Beastegargoyl View Post
@tiny-tim- Did you come up with an answer of .40m/s where that incportates both rivers?
I go 4.0 times something

what are the units of the problem?
Beastegargoyl
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#7
Nov30-09, 02:15 PM
P: 9
4.7*105L/s and 1.1*106L/s. 130m wide and 30m deep.

The answer needs to be expressed in m/s.
tiny-tim
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Nov30-09, 03:09 PM
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Quote Quote by Beastegargoyl View Post
4.7*105L/s and 1.1*106L/s. 130m wide and 30m deep.

The answer needs to be expressed in m/s.
oh, litres!

ok, then i make it .40m/s


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