# Search results

1. ### Reducing Water Pressure (Pipe sizing)

I agree and this is exactly why I think it is unnecessary, but I need a good concise way to explain it to the team so that they also agree. I think it should be fine for us to drain staright from the filter to the facilities line without making any changes. It is simply a gravity fed drain line...
2. ### Reducing Water Pressure (Pipe sizing)

What if we just used an orifice plate? I still don't think any of this is necessary as there is no way that our 2L of 55psi is going to pressurize the open drain line but some people require extra assurance.
3. ### Reducing Water Pressure (Pipe sizing)

I have a problem at work and unfortunately it has been too long since I have been in a class room for me to reason this one out, never did like fulid mechanics much :). We have filter that is pressurized to approximately 55 psi. Once ever 12min or so this filter purges a volume of ~2L that...
4. ### Algebraic C-Grid Geneartion Airfoil - Matlab

I'm looking to generate a C-grid for an airfoil using Matlab with clustering at the surface and wake region. I've looked at a book called Computational Techniques for Fluid Dynamics Vol. 2 and it does a decent job of explaining it and has a code but the language is in Fortran and I have no...
5. ### Tennis Ball Cannon Pressure & Exit Velocity

Unfortunately I do not have a working model built yet, and wont for quite some time. Am I to believe there is not such equation in existence? I highly doubt that. I've seen a couple somewhat complicated differential equations that were used to arrive at the result I'm looking for but I cant say...
6. ### Tennis Ball Cannon Pressure & Exit Velocity

Yes this is far from an idealized situation and I figured I would take these things along with drag and friction into account when I actually have a working model to test varying pressures/distances with but for the time being I'm just looking for an expression to analytically determine the...
7. ### Tennis Ball Cannon Pressure & Exit Velocity

I'm designing a tennis ball launcher using compressed air that will hopefully be able to hit a target at some distance away. We wont know the exact distance until the day of the competition, but I was curious if there was some relatively simple equation relating the pressure of the compressed...
8. ### Ratiation Energy problem

Have this HW for a Thermofluids class and I'm a little confused. Problem A) Use small Biot number approximation to derive the energy equation for a small solid sphere of radius "a" which exchanges radiative energy with a large sphere of radius "b". B) If B -> infinity, show the energy...
9. ### Plotting stress tensor in MATLAB, Parametric Surface

First off, I'm not sure if matlab questions go here or not, or if they are even dealt with on this forum. If not more or remove I guess. I am no matlab wiz so this is mind-boggling to me. I am given a state of stress at a critical point of a component and told to plot a 3D parametric surface...
10. ### Boundary conditions for a 4th order beam deflection equation

thanks, I was getting confused because some sites had "common beam" equations that were different than others.. until i realized that the supports were on different sides and thus their coordinate system was changing. now it makes sense.
11. ### Boundary conditions for a 4th order beam deflection equation

What would the boundary conditions be for a fourth order differential equation describing the deflection (elastic curve) of a propped cantilever beam with a uniform distributed load applied? i.e. a beam with a built in support on the left and a simple support on the right. I need 4 obviously but...
12. ### A column under thermal stress

I have a problem with a constrained column under thermal stress where I am to find the reaction forces at the supporting ends of the column due to its own weight after being heated. Attached is the problem, equations used, and my solution attempt. I tried to solve for the reaction forces...

The more I work on this the more confused I get. For now I just want to be able to clearly understand the simple one material model, and have an answer in front of me that I don't have to second guess. ugh.

*Edit: "To answer your third question, if you apply only an end force to the rod, but you apply no other applied load (not even gravity), then the force in the rod is constant along the length of the rod. Yes, the limits of integration should be 0 to x." You say the force in the rod is constant...

Here is a simplified version of this problem. In this version we just have one material. Can I do what I have done in that image? Since total deformation of the beam is 0 can we think of it as the beam first being compressed by its own weight, and then be extended by the upward...

Some thoughts that I need clarifying. 1. In the sketch in my last post are P1 and P2 constant through out the beam? Like I said it's been a while since I have studied this material, but I want to say yes. 2. If they are constant, do P1 and P2 share the load W(weight of the beam) equally...

Hi Im trying to help a friend of mine out with this problem he has in a solid mechanics class he is taking, but it has been awhile since I took that course so i was hoping you guys could help me help him :) Here is the problem he gave me. in that image p1 p2 and E1 E2 are the...
18. ### Tension Force question

Any help would be very appreciated :) Edit:(had a thought) Would the tension that the cable car's cable would feel be half that of the total force being applied to the cable car since it is being essentially between two cables?
19. ### Tension Force question

Question: The cable cars in San Francisco are pulled along their tracks by an underground steel cable that moves along at 9.5mph. The cable is driven by large motors at a central power station and extends, via an intricate pulley arrangement, for several miles beneath the city streets. The...
20. ### Relativistic density

You say old-fashioned. Do they now use it in the way relating it to the Energy of the particle. Such as in the case of the E^2 = (mc^2)^2 + (pc)^2?
21. ### Time Dilation homework

Because relative to itself a beam of light would travel there and back in a shorter amount of time than the spaceship. I guess i was thinking of the beam of light relative to time on earth rather than to itself.
22. ### E=mc^2 question

so using the expression that Ben gave me I would solve for p then? Edit: Or if i wanted to continue on my original path i would solve for v and then plug that into the equation for relative momentum, and solve for it in terms of mc. i calculate the v to be v= 0.97c p= mv/(square...
23. ### Time Dilation homework

So even though a photon of light would take ten years to get there and ten years to get back.. a total of 20 years. I guess it just seems weird to me that, unless i am thinking about this the wrong way, it would take longer for a beam of light traveling at the speed of light than this spaceship.
24. ### Relativistic density

More than likely it is the relativistic mass. In which case i would need to solve for the relative mass of the particle while moving at .9c as well as the contraction factor of the cube.. 2000/square root(1-0.9^2)= 4588.31 kg and the calculated relative dimensions of the cube were calculated...
25. ### Relativistic density

I think i forgot to square my velocity initially. The answer should be 2000 kg/ .436m^3 or 4588.31 kg/ m^3?
26. ### Time Dilation homework

So then i would take this velocity and put it into my original equation and solve for deltaTprime.... When i do this i get a time value of 15 years, using 25 years as the deltaT. Then I would add one year to that for the time that was spent on the other planet? So their chronometers would read...
27. ### Time Dilation homework

Oh right because its 10ly away from earth ... Ok that makes sense. Thank you.
28. ### E=mc^2 question

What is the momentum of a particle whose total energy is four times its rest energy? Give your answer as a multiple of mc. Well the rest energy of an object is E=mc^2 so the total energy for this particle would be E= 4(mc^2) in order to achieve this Energy value the Lorentz factor would...
29. ### Time Dilation homework

hmm it seems odd that the time on earth would give you a correct value for the velocity considering that the distances would change when approaching such great speeds.
30. ### Time Dilation homework

so i wouldn't use that equation then for part a. I would just take 20 ly/25 yrs? (20*3*10^8)/(25)= 2.4 * 10^8 2.4/3= 0.80 v= 0.80c