<?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>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422009000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Un tratamiento alternativo para el análisis de la colisión elástica bidimensional no relativista entre dos esferas rígidas con parámetro de impacto dado]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Solórzano]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Díaz]]></surname>
<given-names><![CDATA[L.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Pedagógica Experimental Libertador Instituto Pedagógico de Caracas Departamento de Matemáticas y Física]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Centro de Investigación de Física y Matemáticas  ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>57</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422009000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422009000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422009000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un novedoso tratamiento para el cálculo de las velocidades después de la colisión elástica bidimensional de dos esferas rígidas con un parámetro de impacto dado. Para tal fin, definimos el vector de colisión <img src="../../../../../img/revistas/rmfe/v55n1/a8s1.jpg">, el cual es invariante ante transformaciones de Galileo. El vector <img src="../../../../../img/revistas/rmfe/v55n1/a8s1.jpg">conduce a una forma alternativa de la regla de colisión de Newton.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present a novel treatment for the calculation of the velocities after a two-dimensional elastic collision of two rigid spheres with impact parameter given. For that, we define the collision vector which is invariant under Galilean transformations. The vector gives an alternative form of Newton's collision rule.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Colisión elástica]]></kwd>
<kwd lng="es"><![CDATA[regla de colisión]]></kwd>
<kwd lng="es"><![CDATA[parámetro de impacto]]></kwd>
<kwd lng="es"><![CDATA[mecánica clásica]]></kwd>
<kwd lng="en"><![CDATA[Elastic collision]]></kwd>
<kwd lng="en"><![CDATA[collision rule]]></kwd>
<kwd lng="en"><![CDATA[impact parameter]]></kwd>
<kwd lng="en"><![CDATA[classical mechanics]]></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>Un tratamiento alternativo para el an&aacute;lisis de la colisi&oacute;n el&aacute;stica bidimensional no relativista entre dos esferas r&iacute;gidas con par&aacute;metro de impacto dado</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>S. D&iacute;az&#150;Sol&oacute;rzano<sup>a,b </sup> y L.A. Gonz&aacute;lez&#150;D&iacute;az&ordf;</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup><i> Departamento de Matem&aacute;ticas y F&iacute;sica, Instituto Pedag&oacute;gico de Caracas, UPEL, </i><i>Av. P&aacute;ez, Caracas 1021, Venezuela.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Centro de Investigaci&oacute;n de F&iacute;sica y Matem&aacute;ticas, CIMAFI, AP47270. Caracas 1041&#150;A, Venezuela.</i></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 junio de 2008    ]]></body>
<body><![CDATA[<br> Aceptado el 6 de febrero de 2009</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">Presentamos un novedoso tratamiento para el c&aacute;lculo de las velocidades despu&eacute;s de la colisi&oacute;n el&aacute;stica bidimensional de dos esferas r&iacute;gidas con un par&aacute;metro de impacto dado. Para tal fin, definimos el vector de colisi&oacute;n <i><img src="/img/revistas/rmfe/v55n1/a8s1.jpg">, </i>el cual es invariante ante transformaciones de Galileo. El vector <i><img src="/img/revistas/rmfe/v55n1/a8s1.jpg"></i>conduce a una forma alternativa de la regla de colisi&oacute;n de Newton.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Colisi&oacute;n el&aacute;stica; regla de colisi&oacute;n; par&aacute;metro de impacto; mec&aacute;nica cl&aacute;sica.</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">We present a novel treatment for the calculation of the velocities after a two&#150;dimensional elastic collision of two rigid spheres with impact parameter given. For that, we define the collision vector which is invariant under Galilean transformations. The vector gives an alternative form of Newton's collision rule.</font></p>     <p align="justify"><font face="verdana" size="2">Keywords: Elastic collision; collision rule; impact parameter; classical mechanics. </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: 01.55+b; 45.20df; 45.20dh; 45.50.Tn</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmfe/v55n1/v55n1a8.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>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. D. Holliday y R. Resnick, <i>F&iacute;sica, Primera parte </i>(Compa&ntilde;ia Editorial Continental S.A., M&eacute;xico, 1984).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8451413&pid=S1870-3542200900010000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. I.V. Sav&eacute;liev, <i>Curso de F&iacute;sica General, Tomo 1 </i>(Editorial MIR, Mosc&uacute;, 1989).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8451414&pid=S1870-3542200900010000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">3. R. Serway y J. 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