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  1. I

    I am offended by the narrow vision of this forum

    How unamerican. I am ashamed to have posted a creative intellectual idea here, then to have it criticized simply because it has not been published in a peer-reviewed journal! And further to have the thread locked to prevent further discussion, not that it was possible given the attitude here...
  2. I

    Time Dilation and Black Hole Inflation

    Thanks for that intelligent feedback, thanks so much. To be as blunt as yourself, published theories are unintelligible tripe. It must be embarrassing for 'real' scientists to know that I can come up with ideas all by myself that attempt to explain all the phenomena that their theories attempt...
  3. I

    Time Dilation and Black Hole Inflation

    From the link that you posted: "The previous argument against the big bang being a black hole still applies. The black hole singularity always lies in the future light cone whereas astronomical observation clearly indicate a hot big bang in the past." The astronomical evidence that they...
  4. I

    Time Dilation and Black Hole Inflation

    I've read Einstein's book, "Relativity: The Special and the General Theories" and he specifically used centripetal force at a point on the rim of a spinning disk as equivalent to gravitational force. The tangential velocity gives time dilation and length contraction values, in accordance with...
  5. I

    Time Dilation and Black Hole Inflation

    1. Is it true that an atomic clock will run faster at a higher altitude where gravity is weaker? 2. Would time slow down almost to a stop as one approaches infinitesimally close to a black hole event horizon? 3. If time slows down near a black hole, then from a vantage point very near a...
  6. I

    Time Dilation and Black Hole Inflation

    Here's the idea: As one approaches the event horizon of a black hole, gravity increases, and time slows. The outside universe appears to speed up. The rate of infalling matter increases, which is consumed by the black hole to increase it's mass. The Schwarzschild radius of the black hole...
  7. I

    New university student in aerospace engineering program

    Please discuss the differences between drafter, designer and engineer. Enlighten me. But first let me guess... "drafter" has 7 letters, while "designer" and "engineer" have 8 letters. Furthermore the latter two use completely different letters of the alphabet and (when pronounced correctly)...
  8. I

    New university student in aerospace engineering program

    So what do you do? Computer aided design? You know they taught us that in high school. I've got 2 years architectural drafting on AutoCAD and IronCad in grades 11 and 12. I hear community college grads are doing the same thing in their CNC machining and toolmaking programs. You see, I just...
  9. I

    New university student in aerospace engineering program

    I've talked to human resources people. They always scan resumes for keywords - really specific things, for specific jobs. They take a highlighter and highlight those words on your resume. If your resume has a lot of bright yellow streaks on it, you have a good chance of getting hired. It's...
  10. I

    New university student in aerospace engineering program

    I've had a few jobs. But I've never had any choice in it. One has to take whatever is available. One job I had was door-to-door sales of home security systems, another involved merchandising displays for lady's cosmetics, another was digging out the foundations of houses by hand and pouring...
  11. I

    New university student in aerospace engineering program

    But there must be a specific job, otherwise there wouldn't be a profession called "Aerospace Engineer". It's got a National Occupation Code and everything. Such a job must exist. Or... maybe it's the university program that still exists, while the profession has become obsolete. I can't...
  12. I

    Deriving the Implicit Equation of a Rotated Spheroid

    Come on, there's got to be someone smarter than I am...
  13. I

    New university student in aerospace engineering program

    But employers are so rare that it's hard to figure out what THEY want!
  14. I

    New university student in aerospace engineering program

    Hello, I have enrolled in aerospace engineering at university and I am trying to figure out what kind of jobs I'm going to be training for specifically. Does anyone have a hint?
  15. I

    Deriving the Implicit Equation of a Rotated Spheroid

    Here are the formula I've been using Obviously I could have stopped with equations 5 thru 7, and worked with the mesh spheroid surface. The program worked perfectly up to this point. But I wanted a faster program, and that required an implicit formula for the spheroid. After I plugged...
  16. I

    Deriving the Implicit Equation of a Rotated Spheroid

    I was afraid you would say that. 'Cause that's what I did. Unfortunately my implicit equation spheroid isn't behaving the same as my numerical spheroid (bunch of points or "mesh"). My mesh spheroid is doing exactly what it should do intuitively, which seems to verify that my rotation and...
  17. I

    Deriving the Implicit Equation of a Rotated Spheroid

    A spheroid is defined by: x2/a2 + y2/b2 + z2/a2 - 1 = 0 (equation 1) where a and b are the semi-major and semi-minor axes, respectively. If you have any two of x,y,z-values, you can solve for the third, simply by rearranging the above equation: x = +/- sqrt(1 - y2/b2 -...
  18. I

    Rotated Spheroid

    Looks like I made a few not-so-obvious typos, and that was the cause of my problem. My methods were correct. Now that the typos are fixed, everything checks out, the results plot nicely. Cool. This problem had me stumped for quite a while.
  19. I

    Rotated Spheroid

    The constants would be known exactly by the original spheroid equation prior to rotation, i.e. semi-major and semi-minor axes. These would be changed in a known and exact way by the angles of rotation, resulting in exact values for the constants of the final equations. Unless there is a...
  20. I

    Rotated Spheroid

    Ok. The surface normal is always perpendicular to the z-axis, and rotates about it, such that the partial derivative of the rotated spheroid equation F with respect to z is zero. Fz(x,y,z) = Ex + Fy + 2Cz + I = 0 What you said. Solving for z: z = -(I + Ex + Fy) / (2C) and...
  21. I

    Rotated Spheroid

    Ok. But in your solution, the tangent plane has just as many unknowns as the original equation. Not a complete solution I'm afraid.
  22. I

    Rotated Spheroid

    I derive all equations by hand. I'm looking for a step-by-step solution to this problem.
  23. I

    Rotated Spheroid

    If I take a spheroid (slightly flattened sphere) with the following equation: x2/a2 + y2/b2 + z2/a2 - 1 = 0 and rotate it by arbitrary angles about the x-, y-, and z-axes, the new equation for the rotated spheroid is: Ax2 + By2 + Cz2 + Dxy + Exz + Fyz + Gx + Hy + Iz + J = 0 How do I...
  24. I

    Vortex Panel Method

    According to my reference, your original equation is incorrect. It should have cosBeta[i] to the right of Vfreestream. Also, the subscript on lambda should be [j], not what your equation shows. Both source panel and vortex panel methods are numerical methods for flows over arbitrary shapes...
  25. I

    Grand Challenge

    I'm a little disappointed in the responses, particularly that this thread was moved to "Homework-Grade K-12" category as it is almost certainly too advanced a subject for even university bachelors degree level. I was hoping to see something along the lines of advanced optics: large-source...
  26. I

    Grand Challenge

    "Effective" means whatever you think would work. Solutions need to be more creative though. Concepts may not include (updated): 1. photovoltaics 2. mirror concentrators 3. photosynthesis 4. Dyson spheres 5. black hole physics ... unless they are truly honest-to-god sophisticated and...
  27. I

    Grand Challenge

    What is the most effective way to obtain energy from a star? Answers may not include: 1. photovoltaics 2. mirror concentrators since they are already well understood.
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