Recent content by mrmiller1

  1. M

    Inline Mixing Pressures

    Thanks. That makes sense. Any idea how much pressure a glued cpvc joint will stand? I know the piping itself is rated to 400 psi (2" sch 80) and I suspect if I use a longer setting glue it will only take it down to around 200. My instrument flanges are rated for 150, so that's probably my limit.
  2. M

    Inline Mixing Pressures

    I have two streams at controlled flow rates that will mix via an inline static mixer. Both streams will have check valves before the mixer, however, do I have to worry about fighting pressures in this situation? If the one stream is 40 psi and the other is only 20 psi, will the 20 psi line...
  3. M

    Neutralizing a basic reaction with HCl

    Can you simply add the HCl drop-wise until your pH probe or paper yields a neutral result?
  4. M

    Van't Hoff Approach to Finding ∆H and ∆S

    The ∆H is always assumed to be constant with temp in this equation (standard enthalpy change), which is an obvious downside to the relation. If you derive it from (d ln(K)) / (d 1/T) = -∆Ho/R you will find that from the integration.
  5. M

    General Chemistry Lab, need some help

    This is just a study of density, which is a property of a substance. The density is how much mass for a given volume, thus having units of grams per milliliter (g/mL = g/cm^3). At the same temperature and pressure this property is always constant provided the substance is chemically the same...
  6. M

    Parabolic function

    If you graph two functions, y=x^2 and y=5x^2 you will notice the first graph appears "fatter" and the second graph is "skinnier". As you increase the coefficient a the more narrow the graph becomes. As you decrease the coefficient a the wider the graph becomes. I would experiment with this...
  7. M

    Energy question

    Yeah, I was just messing. So in general power (P) is similar to energy (E) the same way velocity (V) is similar to displacement (x). The derivative of energy with respect to time is equal to power. dE/dt = P vs. dx/dt = Vx
  8. M

    Energy question

    Almost. 120,000 J.
  9. M

    Why total energy equals sum of subenergies

    I don't believe the internal energy of the liquid would change if you cut the gas in half. Maybe if the container was pressurized and by removing that amount of gas you altered the pressure and as a result changed the liquid's energy, but I'm not so sure otherwise. Ask yourself why we calculate...
  10. M

    Engineering Transition to Civil from Mechanical Engineering?

    You should really check the salary statistics for ME's vs. CE's before you switch. ME's make a lot more and are rarely required to take the FE as well as PE exams like 99% of civils are required to do.
  11. M

    Simple question about ammonia/water solutions

    The first problem you would have is separating the water and ammonia that didn't react from your desired products. I can't think of any way to do that which wouldn't encourage them to react back to water and ammonia (i.e. time, mixing). Nitrogen prefers 3 bonds and oxygen 2. Therefore, the...
  12. M

    Basic Statics/Dynamics System of Equations (help!)

    Havn't studied your jpeg but if your equations are all linear then you should only need the 6 equations with the 6 unknowns. You might be over-specifying. If you think it's an algebraic mistake maybe you could try solving via matrix (6x6^-1 * 6x1)?
  13. M

    D/dx of trig function

    Actually, you're correct. I solved it numerically real quick and input values for a,b,u and got the same results from your solution. Nice job.
  14. M

    Detecting Water Flow Through Pipe

    The most reliable way would be to drill a tiny hole in the piping (PVC?) on the up side (away from the direction of gravity) and somehow tape a bag over top of the hole. The bag should inflate when there's flow. You could also just put a tire pressure gauge into the hole. Change in pressure...
  15. M

    Engineering Petroleum engineering and other engineering questions

    There is a ton of chemistry in petroleum engineering. You're looking at probably 6 courses in chemistry (minimum!) which would be 2 general chemistry, 2 organic chemistry, and another two physical chemistry courses. In addition the university that offers the degree will likely want you to take...
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