Recent content by ChrisEffinSmi

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    Pressure drop across a tube section - compressible flow

    Thanks for the rapid attention! Unfortunately yes. In actuality it's a small tube fitting welded to a much larger pipe. At first I thought to approximate it as an orifice, but the feed's ID is the same as the fitting's, and the pipe it's welded to is sufficiently large to be considered as...
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    Pressure drop across a tube section - compressible flow

    So, a coworker approached me today with a 'simple problem' to solve, looking to sanity-check a design choice. Much to my dismay, I had no idea how to approach it. Worse, google had no straight-forward answers either, and any formulae I did find seemed circular. This seems too simple to...
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    Projectile motion with two angles

    Oh gods! How stupid of me! My angle should be \alpha - \phi, not just \alpha. That makes my derived answer sin(\alpha-\phi)*cos(\alpha-\phi+\phi) = cos(\alpha)*sin(\alpha-\phi) which is, of course, the desired result. I should sleep more. Thanks for the reply!
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    Projectile motion with two angles

    First, I struggled with whether to put this in advanced or intro physics. I read the sticky, and since this is a 300 level class that is taken at the junior level in the physics BS program at my school, I put it here. If it's considered too simplistic for advanced physics, I apologize. I've...
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    Is Cu(ClO4)2 Omitted in Net Ionic Equations?

    I've been struggling with this for a while now. Cu(ClO4)2 is soluble so it should drop from both sides of the net ionic equation, right? Leaving only H20. Am I missing something? http://usera.imagecave.com/hotrod73dart/question/netionic.JPG
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    Astronomy Logic and Accuracy: Check Your Homework with RQs and P3

    Working on a homework for a general astronomy class. Just want to make sure I'm not being inaccurate. Please let me know if I goofed something up. Thanks! RQ7: The word “apparent” in “apparent visual magnitude” is used to denote its dependence on viewing distance. These numbers refer to...
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    Finding Acceleration in Atwood's Machine

    Edit: Today I was shown how to break this down into multiple free-body diagrams, and introduced to Cramer's Rule. I'm in the process of reattempting this problem. Once I have a solution (and it's verified as correct) I will post it for others having similar trouble. I'm having a terrible time...
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    Very trick velocity vs. time graph

    Thanks so much. It was very difficult until Feldoh pointed out the fact that while the acceleration graph was sloping downward it was still a positive value, meaning that velocity was still increasing, just not as largely incremental. Then it was easy to extrapolate that the negative...
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    Very trick velocity vs. time graph

    If my newest attempt is correct then yes, your image helped very much. Otherwise, I'm still lost. http://usera.imagecave.com/hotrod73dart/question/vgraphattempt3.jpg
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    Very trick velocity vs. time graph

    No calculus yet unfortunately. Those sharp points are supposed to be sharply rounded curves, but I don't think that makes much sense either. I'm aware of what acceleration is, but when acceleration is changing at a non-constant rate (curved acceleration graph), then that means that velocity is...
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    Very trick velocity vs. time graph

    Very tricky velocity vs. time graph Homework Statement Doing a very basic lab on force and motion and ran into a snag with a graph. It's a very wildly changing acceleration graph, and I'm unsure how to proceed with the matching velocity graph. I know that a curved acceleration graph would...
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    Ridiculus position-time graph extrapolation

    It's frustrating how ambiguous it is. This is a 100-level physics class (introduction to physics), mostly Newtonian mechanics using only algebra/trig. As you can see from the other two graphs, this lab is supposed to be pretty simple stuff. Just getting a feel for what acceleration is and how...
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    Ridiculus position-time graph extrapolation

    Sorry! Would you believe that the whole time I was posting I was telling myself to remember to mention it was graph b? *sigh*, my brain is mush at the moment. Fixed! Thanks for pointing it out.
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    Ridiculus position-time graph extrapolation

    I'm working on some physics lab homework and one particular graph is obnoxious. It's hard to tell whether it's intended as a compound curve, or if it's just a piss-poor sketch. I've contacted my professor but he hasn't responded for days, and it's due tomorrow. If I'm not mistaken, the...
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