Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 17-21, 1897

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        <div xml:id="echoid-div183" type="section" level="1" n="119">
          <p>
            <s xml:id="echoid-s4111" xml:space="preserve">
              <pb o="36" file="350" n="350"/>
            ſelbe in den Weltraum hinein. </s>
            <s xml:id="echoid-s4112" xml:space="preserve">Daher verliert die Uhr die
              <lb/>
            Kraft; </s>
            <s xml:id="echoid-s4113" xml:space="preserve">aber die Kraft iſt nicht verloren. </s>
            <s xml:id="echoid-s4114" xml:space="preserve">— Auch ein Pendel
              <lb/>
            giebt die ihm durch Aufheben erteilte Kraft in der Form von
              <lb/>
            Wärme aus, das heißt, es verwandelt ſich die durch Reibung
              <lb/>
            zerſtörte äußerliche Bewegung in eine Inner-Bewegung im
              <lb/>
            Pendel, im Aufhängepunkt derſelben und in der umgebenden
              <lb/>
            Luft. </s>
            <s xml:id="echoid-s4115" xml:space="preserve">— Und was in dieſen Fällen im Kleinen und im Un-
              <lb/>
            ſcheinbaren geſchieht, das geht auch in gewaltigen Erſcheinungen
              <lb/>
            im großen, weiten Weltall vor ſich, und darum wollen wir uns
              <lb/>
            denn auch in dieſe weiteſten Fernen hineinwagen und dort
              <lb/>
            nachſpüren, was unſere Denker von der Kraft, von der Be-
              <lb/>
            wegung und von der Wärme und von dem Weltleben im
              <lb/>
            großen und ganzen Merkwürdiges und Lehrreiches ausgeſonnen
              <lb/>
            haben.</s>
            <s xml:id="echoid-s4116" xml:space="preserve"/>
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        </div>
        <div xml:id="echoid-div184" type="section" level="1" n="120">
          <head xml:id="echoid-head136" xml:space="preserve">
            <emph style="bf">X. Wie ſich im Weltraum Bewegung in Wärme</emph>
            <lb/>
            <emph style="bf">verwandelt.</emph>
          </head>
          <p>
            <s xml:id="echoid-s4117" xml:space="preserve">Aus dem Geſetze der Erhaltung der Kraft erklärt ſich
              <lb/>
            nicht nur ſo manche Erſcheinung, z. </s>
            <s xml:id="echoid-s4118" xml:space="preserve">B. </s>
            <s xml:id="echoid-s4119" xml:space="preserve">beim Fall der Meteor-
              <lb/>
            ſteine, ſondern es läßt ſich jetzt auch der Grad der Hitze ziem-
              <lb/>
            lich genau angeben, in welche jedes Lot einer ſolchen Maſſe
              <lb/>
            geraten muß, wenn es durch Eintritt in die Erdatmoſphäre
              <lb/>
            eine beſtimmte Summe von Geſchwindigkeit einbüßt.</s>
            <s xml:id="echoid-s4120" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4121" xml:space="preserve">Im allgemeinen kann man annehmen, daß einige der
              <lb/>
            kleinen Maſſen, welche unſere Sternſchnuppen, Leuchtkugeln
              <lb/>
            und Meteore bilden, urſprünglich eine Geſchwindigkeit in ihrem
              <lb/>
            Umlauf um die Sonne beſitzen, die der Geſchwindigkeit der
              <lb/>
            Erde ſehr nahe kommt. </s>
            <s xml:id="echoid-s4122" xml:space="preserve">Sie beträgt hiernach beinahe fünf
              <lb/>
            Meilen in der Sekunde.</s>
            <s xml:id="echoid-s4123" xml:space="preserve"/>
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