<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2003000200012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[What fuel for a rocket?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[E. N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Consejo Nacional de Investigaciones Científicas y Técnicas Centro Regional de Investigación Científica y Tecnológica ]]></institution>
<addr-line><![CDATA[Mendoza ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<volume>49</volume>
<numero>2</numero>
<fpage>191</fpage>
<lpage>193</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2003000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2003000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2003000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Elementary concepts from general physics and thermodynamics have been used to analyze rocket propulsion. Making some reasonable assumptions, an expression for the exit velocity of the gases is found. From that expression one can conclude what are the desired properties for a rocket fuel.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se han utilizado conceptos sencillos de física general y de termodinámica para analizar el problema de la propulsión de un cohete. Haciendo algunas suposiciones razonables se ha encontrado una expresión para la velocidad de expulsión de los gases que muestra cuales son las características deseables de un buen combustible para cohetes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Rocket propulsion]]></kwd>
<kwd lng="en"><![CDATA[thermodynamics teaching]]></kwd>
<kwd lng="es"><![CDATA[Propulsión de cohetes]]></kwd>
<kwd lng="es"><![CDATA[enseñanza de la termodinámica]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Ense&ntilde;anza</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>What fuel for a rocket&#63;</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>E. N. Miranda*</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Centro Regional de Investigaci&oacute;n Cient&iacute;fica y Tecnol&oacute;gica &#45; Consejo Nacional de Investigaciones Cient&iacute;ficas y T&eacute;cnicas,</i> <i>5500 &#45; Mendoza, Argentina. </i>e&#45;mail: <a href="mailto:emiranda@lab.cricyt.edu.ar">emiranda@lab.cricyt.edu.ar</a><a href="mailto:emiranda@lab.cricyt.edu.ar"></a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 19 de agosto de 2002.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 13 de diciembre de 2002.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Elementary concepts from general physics and thermodynamics have been used to analyze rocket propulsion. Making some reasonable assumptions, an expression for the exit velocity of the gases is found. From that expression one can conclude what are the desired properties for a rocket fuel.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Rocket propulsion; thermodynamics teaching.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se han utilizado conceptos sencillos de f&iacute;sica general y de termodin&aacute;mica para analizar el problema de la propulsi&oacute;n de un cohete. Haciendo algunas suposiciones razonables se ha encontrado una expresi&oacute;n para la velocidad de expulsi&oacute;n de los gases que muestra cuales son las caracter&iacute;sticas deseables de un buen combustible para cohetes.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Propulsi&oacute;n de cohetes; ense&ntilde;anza de la termodin&aacute;mica.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 1.55; 5.70</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="../pdf/rmf/v49n2/v49n2a12.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <p align="justify"><font face="verdana" size="2">*. Also: Dpto. de F&iacute;sica, Univ. Nac. de San Luis, 5700 &#45; San Luis, Argentina.</font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;J. Cutnell and K.W. Johnson, <i>Physics, </i>2<i><sup>nd</sup></i> ed. (John Wiley &#38; Sons, 1992).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8293225&pid=S0035-001X200300020001200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2.&nbsp;R.A. Serway, <i>Principles of Physics</i> (Sounders College Publishing, 1994).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8293227&pid=S0035-001X200300020001200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">3.&nbsp;H.B. Callen, <i>Thermodynamics; </i>2<i><sup>nd</sup></i> ed. (John Wiley &#38; Sons, 1985).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8293229&pid=S0035-001X200300020001200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">4.&nbsp;L.D. Landau and E.M. Lifshitz, <i>Fluid Mechanics </i>(Pergamon Press, 1959).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8293231&pid=S0035-001X200300020001200004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
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</nlm-citation>
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</back>
</article>
