Recent content by YellowPeril

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    Minimising a vector over a restricted range

    Alright, I did come up with a scheme to arrive at an answer but I am not sure how much to read into it. I used the least squares theorem for a number of equations to arrive at an answer. i.e. X(LS) = (A(t)A)^-1A(t)B where B is the crusher weightometer readings per shift and A is the matrix...
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    How Can You Calculate the Elasticity of a Diving Board?

    Beaubello Maybe this previous thread can get you started https://www.physicsforums.com/showthread.php?t=278252
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    Minimising a vector over a restricted range

    ygolo More information about the problem Matrix equation is [a] [t] = [c] where The matrix [a] is a11 a12 ...a1n a1n is the daily number of loads for truck 1 on day n . . . ...
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    Minimising a vector over a restricted range

    My problem is this. I work on a mine, trucks have a average weight that they can carry (should be approx 180 tonnes) Every end of shift, the weightometer reading at the crusher is taken and the number of loads for each truck is stored in a database. Trucks have weightometers but I...
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    Bow Wave angle vs Boat Speed

    Thanks Fleem, Empirical measurements were what I had in mind. I just needed some background on the variables to see if it would be a worthwhile excercise. From what you have told me it could be worth the effort to make some crude measurements with the GPS while out on the water. Bearing in...
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    Bow Wave angle vs Boat Speed

    Hi From this post you will deduce that one of my hobbies is sailing, I believe that applying a bit of science to the situation will improve my ability to make better tactical decisions on the spot. I have a GPS but am interested in getting a quick visual of boat speed related to the angle...
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    Is the human body topologically equivalent to a donut with multiple holes?

    Sorry DaveC426913, You were originally correct about the ears, the eustachian tube sits behind the ear drum to equalise pressure therefor making it a blind opening. Saw a diagram today which reminded me.
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    Explaining a Bath Time Reflection Puzzle

    This is a picture of me in my bath. (dont worry, it is purely diagramatic!). I face a wall to the front of the bath. There is also a wall to the left hand side of me. Both with shiny tiles. Their is a light above me and slightly behind to my right. While relaxing, I took note of the light bulb...
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    Is the human body topologically equivalent to a donut with multiple holes?

    I don't believe that one can make a distinction about the ears not being an opening, afterall if one considers that the body is comprised of tubes and boilers essentially at low pressure with valves all over the place then the eustacian tube should not be treated any differently from the valve...
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    Why Do Objects Bounce? Exploring Momentum Transfer

    Think about the following real world situations: A rubber bouncy ball bouncing on a floor follows an unpredictable path, this is because there is change in angular momentum due to friction with the floor. A tennis ball follows a more predictable path, except in extreme situations e.g. pro...
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    Why doesn't the "stair step" method approach the shortest distance as step size approaches 0?

    Thanks for the clarification (it helped me understand some of the more technical aspects that were put forward earlier) I did notice the time stamp of a year ago but as I was thinking about the same problem just recently, I decided to venture a comment anyway.
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    Why doesn't the "stair step" method approach the shortest distance as step size approaches 0?

    This is an interesting problem, intuitively I would imagine that one can draw a stair case with a blunt pencil, there is a limit where the thickness of the line would cause the staircase to look like a diagonal. This is the point at which definitions of length would be ambiguous because they are...
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