Recent content by nasu

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    Bullet collision question

    The question was for the OP.
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    Bullet collision question

    Do you have a definition of the coefficient of restitution?
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    Mechanics question: Three masses and a pulley on a tabletop

    If you consider A and B as a system, the only net external force acting on it is the tension on the rope. In this case the mass of the system is ##m_A+m_B##. $$T=(m_A+m_B)a$$ If you consider the blocks A and B separetely, the net force on B is the resultant of the tension in the rope and the...
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    How fast is the fly's shadow moving?

    Your angle marked as 66 degrees is wrong. The bearing of 204 is from north, isn't it? So, what will be the angle made with the south direction, which is a bearing of 180?
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    Electromagnetic field theory -- Potential inside a conducting sphere

    This is your question, not the statement of the problem.
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    A three month long summer vacation from public school seems stupid

    More does not imply better. If you can't improve the 9 months or whatever is it now, what a couple months more do? Thinking that there are simple solutions to complex problems is tempting. Can be dangerous too when the simple "solution" is forced from a position of power.
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    A three month long summer vacation from public school seems stupid

    Sorry, wrong quote. I quoted you quoting the original. I eliminated the author. Anyway, I answered the idea not necessarily the author of it. Didn't know what else to do to correct it.
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    A three month long summer vacation from public school seems stupid

    "But keep teachers busy for the summer, working in schools for one month (being forced to research, bring new approach to material taught, even in sciences), with only one month paid leave in the summer." Teachers need the break at least as much as the children, if not more. (I am not a...
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    A three month long summer vacation from public school seems stupid

    But you'll have to replace the teachers every few years. Thinking about summer vacation it's what keeps them going. I suppose you don't realize how nerve breaking is teaching middle and elementary school nowadays. Or maybe you are in a very nice environment and not a run of the mill public...
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    Current through shorted branch -- clarification

    The larger question does not matter for the OP question. As you already figured out, it was just a matter of comparing two different circuits so each version of the answer is right for the right circuit.
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    Current through shorted branch -- clarification

    Is this diagram from the "some source"? Adding the inductor does not change the premise of your original question. "Some source" is not a very useful reference.
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    Current through shorted branch -- clarification

    Are you sure that the polarity of the batteries in "some source" was the same as in your case?
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    Different way to find center of mass of Hollow hemisphere

    If you use x as the horizontall coordinate, the width of these strips is not dx.