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Cake day: July 10th, 2023

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  • ltxrtquq@lemmy.mltoScience Memes@mander.xyzSquare!
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    2 days ago

    Given r=f(θ), we are generally not concerned with r′=f′(θ); that describes how fast r changes with respect to θ

    You’re using the derivative of a polar equation as the basis for what a tangent line is. But as the textbook explains, that doesn’t give you a tangent line or describe the slope at that point. I never bothered defining what “tangent” means, but since this seems so important to you why don’t you try coming up with a reasonable definition?


  • ltxrtquq@lemmy.mltoScience Memes@mander.xyzSquare!
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    2 days ago

    I think we fundamentally don’t agree on what “tangent” means. You can use

    x=f(θ)cosθ, y=f(θ)sinθ to compute dydx

    as taken from the textbook, giving you a tangent line in the terms used in polar coordinates. I think your line of reasoning would lead to r=1 in polar coordinates being a line, even though it’s a circle with radius 1.


  • ltxrtquq@lemmy.mltoScience Memes@mander.xyzSquare!
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    3 days ago

    Given r=f(θ), we are generally not concerned with r′=f′(θ); that describes how fast r changes with respect to θ

    I think this part from the textbook describes what you’re talking about

    Instead, we will use x=f(θ)cosθ, y=f(θ)sinθ to compute dydx.

    And this would give you the actual tangent line, or at least the slope of that line.


  • ltxrtquq@lemmy.mltoScience Memes@mander.xyzSquare!
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    3 days ago

    Polar Functions and dydx

    We are interested in the lines tangent a given graph, regardless of whether that graph is produced by rectangular, parametric, or polar equations. In each of these contexts, the slope of the tangent line is dydx. Given r=f(θ), we are generally not concerned with r′=f′(θ); that describes how fast r changes with respect to θ. Instead, we will use x=f(θ)cosθ, y=f(θ)sinθ to compute dydx.

    From the link above. I really don’t understand why you seem to think a tangent line in polar coordinates would be a circle.


  • ltxrtquq@lemmy.mltoScience Memes@mander.xyzSquare!
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    4 days ago

    A straight line in polar coordinates with the same tangent would be a circle.

    I’m not sure that’s true. In non-euclidean geometry it might be, but aren’t polar coordinates just an alternative way of expressing cartesian?

    Looking at a libre textbook, it seems to be showing that a tangent line in polar coordinates is still a straight line, not a circle.



  • ltxrtquq@lemmy.mltoMicroblog Memes@lemmy.worldPicture this
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    11 days ago

    When you say red pill, do you mean this one?

    The concept of red and blue pills has since been widely used as a political metaphor in the United States, especially among online hate culture, where “taking the red pill” or being “red-pilled” means becoming aware of purported political biases inherent in society … The supposed truths revealed to those who refer to themselves as “red pilled” often include conspiracy theories, as well as antisemitic, white supremacist, and misogynistic beliefs.


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    I’m not sure I believe you about your first point.










  • I see what you’re trying to say here, but the study gets its mileage data from the US Department of Transportation Federal Highway Administration’s (FHWA) 2002 highway statistics, so it’s an estimate of the total number of miles driven by each category of vehicle. I think the bigger problem with using this study to say that motorcycles are worse than cars is that the “3.77x more likely to kill a child per mile” is based on 4 deaths caused by motorcycles that year. We’re dealing with numbers so small that one accident caused or prevented could swing the “probabilities” wildly in different directions.

    Here’s a link to the full study if you’re interested. You’re right that it doesn’t seem to cover injuries though.