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"So, is it ready?"
"Yes sir, all your modifications have been made. The car's
just this way."
"That's great! Great. Please... show me."
"Ok sir. First of all, built into the suspension we have an
intermittent vibration pulser. These things are tightly
controlled, synchronised, and pre-programmed
to increase
in vigour at your discretion. They'll give a lovely ripple to
any standing liquids in the car, either on the dashboard or
in cup holders. Hey, you could be holding it steady in your
hand and you'll still get the same effect."
<barely containing excitement>
"We've also installed some surround sound speakers into the
chassis. These work independently from the car's stereo
system. They'll deliver a piercing roar that sounds like it's
enveloping the car. It can be quite disorientating, you
really don't know where the sound is coming from apart
from, maybe, up. (I have some in my Fiesta – for music,
but still, they're tasty...)"
"GGggggg! Go on, go on!"
"Well sir, this one we had to work a little harder on. It's
certainly not a run-of-the-mill modification. Hopefully it'll
be satisfactory. You see the spoiler at the top here?"
"Yeah? Yeah?"
"Well, the mechanism works either from a manual switch
control – there's a button down on the driver's side you can
press on the sly – or it can be voice activated. Just say..."
"Please. Do you mind?"
"Be my guest..."
"Ok... Ahem... 'Where's the goat?'"
A slab of meat on a spring-loaded arm suddenly flings out
of a compartment in the spoiler and lands heavily in a
blood-soaked splatter onto the sun roof.
"YES!"
Square wave image.
http://3.bp.blogspo...U/s1600/charles.jpg
[AusCan531, Apr 22 2012]
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I think I'll opt for the tree-rapelling package. |
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Or a cup of water dashboard accessory that indicates you have just been in an auto collison by rippling. |
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this should be a fiat panda. |
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The Jack-in-the-glovebox Chucky doll is a bit much. |
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//Unless its faux meat its going to take a lot of
maintenance// |
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Maintenance? You'd only have to prime it on the day
you intend to go camping with the family. But
certainly, faux meat could be employed. Which
facilitates flexibility in your scare-mongering. |
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God help us! We're in the hands of engineers. ~ Dr. Ian Malcolm. |
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//They'll give a lovely ripple to any standing liquids in the car, either on the dashboard or in cup holders. //
I think I read the effect was done with a bass guitar string strung under the dash |
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<whispers>
the call is coming from inside your car... |
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// I think I read the effect was done with a bass guitar
string strung under the dash // |
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I recall hearing that as well. Why they didn't just use a real
Tyrannosaurus is beyond me. |
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A real tyrannosaur would cost too much to feed. A guitar
string is only a couple dollars. |
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Yes, but I've always felt that part of the movie suffered for
accuracy. Anyway, they already had the goat. |
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Anyway, I'd wager that it was an electric bass string, not a bass guitar string. |
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Electric upright, then? Not a significant difference. Or did
you mean electric as opposed to acoustic? |
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Wait--why does it matter? And why am I asking myself
these questions? |
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Am I the only one in here? |
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Question: to what extent do the ripples in the cup
correspond to the waveform of the exciting
vibration? |
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If you played a loud enough square-wave at a
manageable frequency, could you generate square
water waves? |
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[Alterother] No, electric bass. The thing the bass player in a rock/pop/whatever band plays, tuned EADG. It's an electrified descendant of the double bass, and not a member of the guitar family. Even though it's mostly played horizontally, with a strap, it is an electric bass. A bass guitar is something else. |
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I find these distinctions at least interesting, if not important. |
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[MaxwellBuchanan] I think you'd get discontinuities rather than square water waves. |
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[spidey], my wife plays all of them, plus cello, flute, and
oboe. There are several prime examples of such
instruments in our library (except for the double bass).
That's why I was being so oddly
specific. |
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Well, that, and I'm half out of my head on pain meds and
bored silly. |
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//discontinuities rather than square water waves// |
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Discontinuities as in up/across/down? That would
suffice. |
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Discontinuities as in separate bits of water. A square wave in water would imply infinite acceleration, which in turn might generate singularities and doom us all. Try it! |
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Actually singularities are OK. Space just sort of
gives up and fudges an answer, and it all goes OK. |
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But, to the square waves. You can create a
standing sine-wave in water. Can one not create
two superimposed sets of standing waves, one a
harmonic of the other, and in the right phase to
get a squaroidal wave? Three sets? Four? |
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I can see that, at some degree of steepness,
things will tend towards exotreopy and you'll wind
up with a mess. But at what degree? |
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//Three sets? Four?// Try a million! No, much more! |
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You can get an arbitrarily close approximation by superimposing harmonics, but a mathematically precise square wave is the superimposition of an infinite number of harmonics. |
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If you're after a wave that looks fairly squarish, and propagates while maintaining that shape, I think you'll find that that's also impossible - the wave will break, instead. I don't have a rigorous proof of that, though. |
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//Try a million! No, much more! // |
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Yes yes. But I was considering only how many sets
of standing waves could be superimposed in
water. I had assumed that exeotropy would set a
limit, but on reflection I think I probably meant
nöeoplasy. |
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Of course you could do it all at scales below the
Laplace-Gerridae limit, but that wouldn't be very
exciting. (Although, on the plus side, you'd create
a water surface which had a fine enough texture
to iridesce nicely.) |
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5 should work fine: 0,3,5,7,9, for the "Bart Simpson" square wave. |
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//Yes yes.// Yes yes yes, but the rhyme was irresistible. |
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Gravity waves on water are pretty non-linear. At shorter wavelengths surface tension starts to dominate, depth and amplitude interact, and at all wavelengths the phase speed does not equal the group speed. I think that that all adds up to water-air standing waves being not even remotely harmonic, so the answer to your question might be 1. |
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It's easy to get square waves in water. Use a saw and temps below freezing. |
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//on a sillyscope// realistically there's no such thing as a square wave: there's always slew time. |
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Linked image of a square wave. Oh, and a bun for
[theleopard]. |
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//there's always slew time.// That sounds very
much like the Friday lunchtime beer-meeting.
Quality slew time. Yay. |
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Can I have a free pen please? |
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Well, you can have the one we used to keep the
velociraptors in. |
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