Recent content by independentphysics

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    Dimensionless value to differentiate between concentrated and dispersed

    Hi Dave, I need a dimensionless value based of physical parameters to differentiate between concentrated mass systems such as the solar system and dispersed mass systems such as a galaxy. I do not understand your proposal. Although it is a dimensionless value, how can it be derived from...
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    Dimensionless value to differentiate between concentrated and dispersed

    I want to find a dimensionless value that differentiates between concentrated mass systems such as the solar system and dispersed mass systems such as a galaxy. I assume spherical and radial symmetry, consider both the cases for point masses or smooth mass distributions. The only value I can...
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    Undergrad Gravity inside an exponential mass disk

    What is the gravitational field intensity in the Kuzmin model in terms of r?
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    Undergrad Gravity inside an exponential mass disk

    If it is axisymmetric, why bother with angles?
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    Programs Physics Bachelors in Europe taught in English

    It got one answer (the other one referred to a master's degree, and not a bachelor). I assume there are more than one university in Europe in which a bachelor in physics is taught in English, so a single university answer can be considered an unsufficiently answered post for the question posted.
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    Undergrad Gravity inside an exponential mass disk

    The Kuzmin model is just one of many. If you want more precise approximations, there are many more for thickened disks. Im just looking for a more simple one than Kuzmin.
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    Programs Physics Bachelors in Europe taught in English

    I am looking for bachelors of physics in Europe taught in english, excluding UK and Ireland. This question was posted here: https://www.physicsforums.com/threads/physics-bachelors-in-europe-taught-in-english.686730/ but got no answers.
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    Undergrad Gravity inside an exponential mass disk

    I am solving it through superoposition. Isnt there a more simple way to do it?
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    Undergrad Gravity inside an exponential mass disk

    Yes.
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    Undergrad Gravity inside an exponential mass disk

    Exponential decay of mass density from center. Axisymmetric disk (not elliptical disk) Surface density = mass density function, since I consider no thickness mass/distance^2
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    Undergrad Gravity inside an exponential mass disk

    It is certainly not. I dont care much about the form of surface density (linear or exponential) as long as it is not a solid disk (which is a completely different case of study).
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    Undergrad Gravity inside an exponential mass disk

    I am trying to understand gravity inside an exponential axysymmetric mass disk with no thickness. I know there are exact solutions for this case, such as the Mestel disk or the Kuzmin model, but I want to work out a simpler solution. I am approaching the subject by linear superposition. For a...
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    How can I calculate the cumulative mass of a disk using disk mass density?

    I was wrong, I find this correct. Thank you very much
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    How can I calculate the cumulative mass of a disk using disk mass density?

    Cumulative mass in function of r is not a definite integral.
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    How can I calculate the cumulative mass of a disk using disk mass density?

    There is a constant (+C) after integrating the density function to obtain cumulative mass M(r), and M(0) is not 0.