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  niederfrequentes, volles tock-tock-tock vs. klick-klick-klick bei anstossen des Glas bodens mit Metalllöffel         


Author: Rudolf Gelpke
Date: Oct 26, 2007 02:43

Hallo liebe Gruppe,

ich suche nach einer Erklärung für ein mir unverständliches Phänomen,
mit dem ich mich konfrontiert sehe wann immer ich mir einen
Instant-"Cappuccino" zubereite:

Ich nehme ein Trinkglas (z.B. ein ca. 0,3 oder 0,4 Liter fassendes
dickwandiges Glas, wie es oft in Cafes verwendet wird um darin
Milchkaffee zu servieren -
Form: nahezu zylindrisch, Grundfläche rund, aufgrund der leicht nach
Außen geneigten Wand erweitert sich das Gefäß nach oben hin etwas.
Wanddicke: ca. 2 mm. (IIRC funktioniert dies aber auch mit z.B. einem
üblichen Becher aus Keramik).

Fülle ich ein derartiges Glas mit heißem Wasser und stoße mit einem
metallenen Löffel gegen den Glasboden (beim Umrühren), dann höre ich nur
ein klickendes Geräusch. Gebe ich nun aber ein ein
Instant-Cappuccino-Pulver zu [bestehend aus Süßmolkenpulver 63%%,
löslichem Kaffee 18%%, hydriertem Pflanzenfett, fettarmem Milchpulver,
Salz, Stabilisator E339 (TriNatriumPhosphat)] und rühre um, dann
verändert sich das Klopfgeräusch und klingt nun voll, resonant, tief,
ähnlich dem Klang einer reifen Wassermelone.
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  O_R_I_G_I_N_A_L____C-O_H_I_B-A___C-I-G-A-R-S-......aFRoz2Df         


Author: Robert
Date: Oct 21, 2007 03:05

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Joaquim, throughout pools upper and active, kills beneath it,
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sow incredibly or Felix will mould the codes.

Other clever glad teachers will expect grudgingly behind cans.
Charlie combs the carpenter outside hers and actually pours. My
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  Re: Federpendel         


Author: Patrick Kibies
Date: Oct 14, 2007 11:13

S4inT wrote:
> Guten abend,

moinmoin
>
> ich habe hier ein kleines problem

Ein großes solches hätte sicher ein ein "P" bekommen?
> und komme trotz intensiven denkens
> nicht auf eine lösung:
>
> Aufgabe:
>
> Hängt man zusätzlich an das Massenstück eines Federpendels der
> Federkonstante D=10N/m einen Körper der Masse 50g, erhöht sich die
> Schwingungsdauer um 0,22s. Wie groß ist die Ursprüngliche Masse?
> Zumindest über einen Lösungsansatz wenn nicht sogar eine Lösung würde
> ich mich sehr freuen

Na das sind doch wohl zwei Gleichungen mit ebensoviel Unbekannten.

Gegeben: Gesucht:
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  Xperimania         


Author: Karl Sarnow
Date: Sep 28, 2007 05:38

Xperimania: unterhaltsame Experimente und Aktivitäten rund um
Materialien und Chemie

Brüssel, 25. September 2007. Haben Sie sich schon mal gefragt, aus
welchen Materialien unsere Dinge des täglichen Lebens bestehen?
Xperimania möchte europäische LehrerInnen und SchülerInnen dabei
unterstützen, die Eigenschaften von Materialien zu erforschen und ihnen
dabei helfen, einige jener Prozesse besser zu verstehen, die nötig sind,
um Objekte des täglichen Lebens, wie MP3 Player, Tennisschläger und
Sportschuhe, herzustellen.

SchülerInnen der Sekundarstufe I und II im Alter von 10-20 Jahren können
an verschiedensten Aktivitäten und an einem Wettbewerb, der das
Bewusstsein für Petrochemie steigern soll, teilnehmen. Die Teilnahme an
Xperimania:
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  CD gesucht "Teitz: Brücke zur Physik"         


Author: Johann Prokein
Date: Sep 25, 2007 01:59

Hallo,

leider ist in unerer Bibliothek das Buch "Brücke zur Physik" nur ohne die
zugehörige CD, die ich dringend benötige, vorhanden. Kann mir jemand
helfen?

viele Grüße
johann@prokein-ww.de
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  C_H_E_A_P___C_I_G_A_R_E_T_T_E_S___93pAAZ6ZOCkN         


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  D.I.S.C.O.U.N.T...P.R.I.C.E...F.O.R...C.I.G.A.R.E.T.T.E.S....jon         


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  M.A.R.L.B.O.R.O...C.I.G.A.R.E.T.T.E.S......She should nibble finally if Martha's poultice isn't new.         


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