Recent content by BluFoot

  1. B

    Volume of a sphere under a linear transformation R3->R4.

    Homework Statement So there's a linear transformation T: ℝ3 → ℝ4, standard matrix A that satisfies det(A e1) = 5, det (A e2) = 4, det (A e3) = 5 and det (A e4) = 5 If S is the unit sphere, find the 3-dimensional volume of T(S). Homework Equations Volume of sphere = 4/3 * pi * r^3...
  2. B

    Surface area obtained by solid of revolution

    OHHH NEVERMIND! I'm stupid, you're looking for surface area, not volume. Ignore everything I've said, sorry!
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    Surface area obtained by solid of revolution

    Deleted.
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    Surface area obtained by solid of revolution

    Deleted.
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    Current in a hollowed nichrome wire

    Looks good to me, you must have done some calculations wrong... If you used wolframalpha or similar, your brackets are wrong so that might have messed it up... I got R=0.00902 ohms, I=277 A
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    Uncertainties of Dimensionless Units

    The way you write uncertainty is fine. But there's not much point in putting the "0.003" if it's ± 0.02... Might as well write: 0.40 ± 0.02
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    Necessity to discharge capacitors in circuits

    Sorry, there was a 7V battery connected that had a wire going to the 3 capacitors, which connected to a switch then back to the battery. We were told to discharge the capacitors by simply taking a wire and putting one end on the positive side of the capacitor and the other on the negative side...
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    Necessity to discharge capacitors in circuits

    Homework Statement 1. Is it necessary to discharge the capacitors before starting the experiment in series? Why? 2. Is it necessary to discharge before starting the experiment in parallel? Why? The attempt at a solution For the first one, we connected 3 capacitors in series, and the...