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  1. Impulse and momentum have the same base units....

    Impulse and momentum have the same base units. Are they the same thing? hmmm
    Torque and energy have the same base units. Are they the same thing? hmmm
    Interesting when using dimensional analysis to...
  2. It's a figure of speech. A metaphor for...

    It's a figure of speech. A metaphor for motivation. A bunch of buzzwords. Also known as BS.
    Maintaining momentum can be anywhere from nothing to almost everything.
    Freefall in a vacuum, walking...
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    Plastic deformation is permanent deformation....

    Plastic deformation is permanent deformation. Solids can flow under pressure. For example toothpaste, peanut butter, putty, clay, lead, aluminium, copper, steels, polyamide etc can be made deformed...
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    The rifle barrel is grooved. The bullet...

    The rifle barrel is grooved. The bullet (projectile) is deformed from a circular cross section into one that is the "mate" of the grooved interior of the barrel. Thus a bit of squeezing and plastic...
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    I have an off qestion remark about the calibre of...

    I have an off qestion remark about the calibre of a gun. In the article you posted on this, in the image, the 22 bullet looked to be so much smaller in case diameter than a 223 did, so the calibre as...
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    Mass is quantity of matter. It is independent of...

    Mass is quantity of matter. It is independent of gravitational field. Force is mass x acceleration. Weight on earth is mass x gravitational acceleration.

    Interestingly: traditional units and...
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    Outer space as in interplanetary space is better...

    Outer space as in interplanetary space is better vacuum than anything artificially made.

    The mass of the ammunition in this case is important. A rifle round (aka cartridge) is comprised of a...
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    There is no point in continuing if you cannot...

    There is no point in continuing if you cannot read and understand what I wrote. Sorry.
    I asked you to do things and you persist in ignoring the instructions.
    This is not a place where slaves do...
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    Muzzle energy - Wikipedia, the free encyclopedia...

    Muzzle energy - Wikipedia, the free encyclopedia

    From rifle ballistic table a 0.600 caliber rifle is 1950 fps / 7596 ft lbs at muzzle

    How much energy to you need get your mass up to 7 miles...
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    Look up the muzzle energy of a 0.600 rifle...

    Look up the muzzle energy of a 0.600 rifle bullet. See if 540 000 of that can accelerate a 10 pound rifle to escape velocity. Start with that.
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    Walter Lewin at his best

    Chuckle chuckle. This is funny on so many levels. The last minutes are hilarious. He has some Einstein in him.


    Air Pressure Can Crush with Walter Lewin
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    I was at a Surface Mount Technology Association...

    I was at a Surface Mount Technology Association conference a few years back. One of the guys there was working on nano-solder.
    I found this: Development of Nano Lead Free Solders

    As for your...
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    "t=0 when the spring is displaced by x. The...

    "t=0 when the spring is displaced by x. The spring takes four seconds to return to equilibrium. This is when the restoring force kicks in."

    I take it that you state the equilibrium point is where...
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    Where is the energy from "old" light going? ...

    Where is the energy from "old" light going?

    Is the Universe Leaking Energy? by Tamara M. Davis in Scientific American July 2010.

    The article was scanned or otherwise reproduced in...
  15. tk421 I corrected myself viz the spelling...

    tk421

    I corrected myself viz the spelling issues.

    As for the "over education" falderal. There are categories of posters who name drop and concept drop some with intimate understanding of and...
  16. Walter Lewin Kirchhoff's rule is for the birds

    A few weeks I looked for these youtubes so as to insert in another thread.
    I had forgotten the lecture names so I never found it then... but I found it a few minutes ago.

    Kirchhoff's rule is...
  17. Hello, We sometimes get great problems like the...

    Hello,
    We sometimes get great problems like the one you pose, where a real situation, with real limitations of the equipment are brought up.
    The battery weight is a significant part of the total...
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    Careful. Perfectly elastic also means absolutely...

    Careful. Perfectly elastic also means absolutely no loss of energy into the environment. No noise, no heat, no everything in or out of those two balls. The P and KE equations hold perfectly.
    Very...
  19. Always integrate. The area under the power usage...

    Always integrate. The area under the power usage (y axis) versus time (x axis) curve is energy consumed.
    The current and voltage must be measured in real time (sampling is fine), the measurements...
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    A well known phenomenom: Hold a remote control...

    A well known phenomenom: Hold a remote control transmitter (garage door opener, car door opener, etc) against your head, it will lengthen the range noticeably. This is not a youtube hoax. The water...
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    Measurement of contact time in short duration...

    Measurement of contact time in short duration sports ball impacts: an experimental method and correlation with the perceptions of elite golfers
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    As has been posted: The force is a function of...

    As has been posted: The force is a function of the interaction. It is a result of how the materials interact. No interactions means no forces. A 5 m/s collision between two 1 kg balls made of brass,...
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    No problem, your welcome. I surmised your OP...

    No problem, your welcome.

    I surmised your OP was well answered in the posts that said the momentum and KE are conserved in perfectly elastic collisions. The best and simplest way to understand...
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    Why do you want to transfer to a better school? I...

    Why do you want to transfer to a better school? I know the Swiss aviation manufacturing industry is not as developed as the American, Russian, British and French industries but the Swiss have the...
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    Take a look at this. Fascinating fun. Momentum,...

    Take a look at this. Fascinating fun. Momentum, Magnets & Metal Balls - Sixty Symbols
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