Momentum and continuity equation

[andyb1990]

Homework Statement

Follow the link to see the question,

http://img507.imageshack.us/img507/2246/fluidquestion.png

Homework Equations

The Attempt at a Solution

currently I can't do part a) but from using part a) I can obtain the forces acting on the cone by using the first part of the equation (ρQ^2/2*A2) and then the force acting on the nozzle by using all of the equation,

for part a) I currently have used the continuity equation to work out what v1 and v2

v1= 0.764 m/s and v2= 8.475 m/s

then I am stuck as what to do with bernoulli's equation if that is the correct next step?

 

[berkeman]

Homework Statement

Follow the link to see the question,

http://img507.imageshack.us/img507/2246/fluidquestion.png

Homework Equations

The Attempt at a Solution

currently I can't do part a) but from using part a) I can obtain the forces acting on the cone by using the first part of the equation (ρQ^2/2*A2) and then the force acting on the nozzle by using all of the equation,

for part a) I currently have used the continuity equation to work out what v1 and v2

v1= 0.764 m/s and v2= 8.475 m/s

then I am stuck as what to do with bernoulli's equation if that is the correct next step?

Is this question from a take-home exam?

 

[andyb1990]

no, They are old exam questions to help us revise.

 

[LawrenceC]

Hint:

You have 3 equations to work with.

1. Continuity equation relates velocities to flow Q.
2. Bernoulli's equation relates velocities to pressure.
3. Momentum equation relates velocities to pressure force and bolt force.

Use all three and you will get the posted answer.