(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A chamber has water entering horizontally with a velcoity of 80m/s with an inlet of an area of [itex] 0.1m^[/itex] and leaving through an opening of area [itex]0.15m^2[/itex]. The exiting flow makes an angle of 30 degrees with respect to the entering flow. What force is needed to hold the chamber in place

2. The attempt at a solution

Well the total force on the chamber is

[tex] \vec{F}=\dot{m_{2}}\vec{v_{2}}-\dot{m_{1}}\vec{v_{1}} [/tex]

and [tex] \dot{m_{2}}=\rho A_{2} [/tex]

and [tex] \dot{m_{1}}=\rho A_{1} [/tex]

the component of the force is

[tex]F_{x}=\rho A_{2} v_{2} \cos\theta - \rho A_{1} v_{1}[/tex]

[tex]F_{y}=\rho A_{2} v_{2}\sin\theta[/tex]

Now heres the thing, we dont know v2...

But since the mass is conserved the volume flow rate in is equal to the volume flow rate out

[tex]\int_{S_{inlet}} \vec{v_{1}}\cdot\hat{n}dA=\int_{S_{outlet}} \vec{v_{2}}\cdot\hat{n}dA[/tex]

[tex]v_{1}A_{1}=v_{2}A_{2}[/tex]

From this we can find the X and Y components and hence the force and the direction. Is this all correct?

Thank you for your input and suggestions!

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# Homework Help: Force on a chamber

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