- #1
~christina~
Gold Member
- 714
- 0
Homework Statement
At a faucet, the diameter of the stream is 0.960cm. The stream fills a [tex]125cm^3[/tex] container in 16.3s.
Find the diameter of the stream 13.0cm below the opening of the faucet.
http://img100.imageshack.us/img100/1258/15222430xr8.th.jpg
Homework Equations
Bernoulli's eqzn: [tex]P+ 1/2\rho v_1^2 +\rho gy = constant [/tex]
or...[tex]P_1-P_2 = \rhog(y_2-y_1)= \rho gh [/tex]
continuity eqzn: [tex]Av_1= Av_2 [/tex]
The Attempt at a Solution
um...I'm not sure how to go about doing this Q...
I did do:
Flow rate= [tex]Av_1= 125cm^3 / 16.3s = 7.67cm^3/s [/tex]
after that I'm not sure about how to find the diameter.
I think I need the Area since Av= 7.67cm^3/s that I found and I guess I would go and find v for the first v1 at least.
I am confused as to:
1. is P1 the same as P2 (bottom of stream) ? If it is then would it cancel out?
2. would the v be the same? I think not...but if it isn't then how would I find v1 for when the water comes out of the faucet?
If someone could help me out I'd appreciate it alot.
Thanks
Last edited by a moderator: