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  1. A

    Bernoulli's Equation- on a jet nozzle

    Can you help me to what the equation would work out to?
  2. A

    Bernoulli's Equation- on a jet nozzle

    Would you subtract the square root from the right hand side to get A2 on its own, then group like terms?
  3. A

    Bernoulli's Equation- on a jet nozzle

    to get A2 dived the right hand side by sqrt...... then by cancelling out wouldn't that leave sqrt rho*g*z??
  4. A

    Bernoulli's Equation- on a jet nozzle

    A2= A0 sqrt (rho*g*z) A2 will be greater
  5. A

    Bernoulli's Equation- on a jet nozzle

    M(dot) is the mass flow rate M(dot)= A0 sqrt (2(Po-B)/rho) = A2 * sqrt (2(Po-B+rho*g*z')/rho) where A0 is exit area at nozzle A2 is a vertical distance z below nozzle i have also subbed in v from part i and part ii
  6. A

    Bernoulli's Equation- on a jet nozzle

    M(dot)= A1 sqrt (2(Po-B)/rho) = A2 * sqrt (2(Po-B-rho*g*z')/rho)
  7. A

    Bernoulli's Equation- on a jet nozzle

    M= rho*A*V = rho*A*V - rho*g*z' ?
  8. A

    Bernoulli's Equation- on a jet nozzle

    that it will always remain constant?
  9. A

    Bernoulli's Equation- on a jet nozzle

    From earlier you said apply continuity equation Q(dot)=AV A=Q/V but now I am unsure what to do with this?
  10. A

    Bernoulli's Equation- on a jet nozzle

    P0 = B + rho*V^2/2 - rho*g*z' v= sqrt (2(Po-B +rho*g*z')/rho)
  11. A

    Bernoulli's Equation- on a jet nozzle

    ii) P0 = B + rho*V^2/2 + rho*g*z' v= sqrt (2(Po-B-rho*g*z')/rho)
  12. A

    Bernoulli's Equation- on a jet nozzle

    stagnation Po = B+1/2* ρ*v^2 v= sqrt (B+1/2*ρ)
  13. A

    Bernoulli's Equation- on a jet nozzle

    i) would the equation be.... B+1/2*ρ*v^2+ρgz'
  14. A

    Bernoulli's Equation- on a jet nozzle

    Homework Statement A jet of liquid of density ρ surrounded by air flows vertically downwards from a nozzle of area Ao. The stagnation pressure of the jet at exit from the nozzle is po and the surrounding air is at pressure B. The acceleration due to gravity is g. If the jet flow is...
  15. A

    Momentum and continuity equation

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

    Momentum and continuity equation

    Homework Statement Follow the link to see the question, http://img507.imageshack.us/img507/2246/fluidquestion.png [Broken] 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...
  17. A

    Heat transfer- determine heat of chip using convection

    Thank you, and also what is the best/easiest way to re arrange for T? I always struggle trying to figure this out!
  18. A

    Heat transfer- determine heat of chip using convection

    and also what is the best/easiest way to re arrange for T?
  19. A

    Heat transfer- determine heat of chip using convection

    so would it be 0.3= 150*(5mm*6mm)(T-293)
  20. A

    Heat transfer- determine heat of chip using convection

    Q represents the amount of heat loss? and units are watts?
  21. A

    Heat transfer- determine heat of chip using convection

    would you divide the heat transfer coefficient by the power input?
  22. A

    Heat transfer- determine heat of chip using convection

    Homework Statement A silicon chip measuring 5mm by 6mm and of thickness 1mm is embedded in a ceramic substrate. At a steady state, the chip has an electrical power input of 0.3W. The top surface of the chip is exposed to a coolant whose temperature is 20°C. The heat transfer coefficient for...
  23. A

    Fluid mechanics- Dimensional analysis

    Homework Statement The drag force F on a car depends upon its speed V, length L, the density ρ of the air and the dynamic viscosity of the air µ . Show that this statement regarding five physical quantities can be re-written in terms of two independent non-dimensional groups...
  24. A

    Help needed for this question - Air pressure in a bike tire

    so the equation including density would look like P=ρ(R/M)T sorry I just cant get my head around it! :( and the actual pressure would be 7bar?
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    No Idea how to work this out! - Charging and discharging an iPod

    so the formula for power P= I . V ?? ----> 5 x 0.5 = 2.5 watts? E= P . t -----> 2.5 x (5*60*60) = 45000 ? then I'm unsure on what to do?
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