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fayan77
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Homework Statement
Determine y2 (ft)and v2 (ft/s) using the momentum principle assume widths are the same at 1 and 2
Homework Equations
from what i remember in my past fluids class, the momentum equation is:
Force = Qvout - Qvin assuming same density and direction
However in my lecture the professor provided another equation
but when i work out the units in this equation left side yields Force and right side is pressure (force/area)
did my professor forget to multiply each pressure with its respective Area? P1A1?
The Attempt at a Solution
using ##\rho####\beta##QV2 - ##\rho####\beta##QV1 = P1A1-P2A2
assume both ##\beta##'s = 1
assume width = 1
using continuity equation Q = V1A1 = V2A2 = (4.55)(1)(8.55)=y2(1)V2
##\rho##(4.55)(1)(8.55)(V2 - V1)= P1(4.55)(1)-P2y2(1)
##\rho##38.9(V2 - 8.55)= P14.55-P2y2
I am stuck