http://www.mysolutions.tecnico.ulisboa.pt//wiki/index.php?action=history&feed=atom&title=M%C3%A1quina_com_duas_roldanas 2026-07-29T06:16:14Z Histórico de edições para esta página nesta wiki MediaWiki 1.35.2 http://www.mysolutions.tecnico.ulisboa.pt//wiki/index.php?title=M%C3%A1quina_com_duas_roldanas&diff=1081&oldid=prev 2016-04-06T13:54:58Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="pt"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Revisão anterior</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revisão das 13h54min de 6 de abril de 2016</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l23" >Linha 23:</td> <td colspan="2" class="diff-lineno">Linha 23:</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>As massas encontram-se inicialmente em repouso e o sistema encontra-se numa região com campo gravítico uniforme no sentido negativo do eixo dos yy.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>As massas encontram-se inicialmente em repouso e o sistema encontra-se numa região com campo gravítico uniforme no sentido negativo do eixo dos yy.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Sabendo que \(m_1 = m_2 = m\), qual das seguintes afirmações é verdadeira:</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Sabendo que \(m_1 = m_2 = m\), qual das seguintes afirmações é verdadeira <ins class="diffchange diffchange-inline">no que toca à evolução do sistema</ins>:</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> </table>

Ist172693 http://www.mysolutions.tecnico.ulisboa.pt//wiki/index.php?title=M%C3%A1quina_com_duas_roldanas&diff=1080&oldid=prev 2016-04-06T13:45:43Z

<p></p> <table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="pt"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Revisão anterior</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revisão das 13h45min de 6 de abril de 2016</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l19" >Linha 19:</td> <td colspan="2" class="diff-lineno">Linha 19:</td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Máquina_duas_roldanas.jpg|thumb|Máquina em questão]]</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:Máquina_duas_roldanas.jpg|thumb|Máquina em questão]]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Considere <del class="diffchange diffchange-inline">um corpo </del>de <del class="diffchange diffchange-inline">massa </del>\(<del class="diffchange diffchange-inline">m</del>\) <del class="diffchange diffchange-inline">(g) que desliza no plano inclinado da figura. Existe atrito cinético </del>\(<del class="diffchange diffchange-inline">\mu</del>\) <del class="diffchange diffchange-inline">entre </del>o <del class="diffchange diffchange-inline">corpo e a superfície </del>do <del class="diffchange diffchange-inline">plano inclinado, sendo </del>que <del class="diffchange diffchange-inline">esta superfície faz um ângulo </del>\(\<del class="diffchange diffchange-inline">alpha\</del>) <del class="diffchange diffchange-inline">com </del>a <del class="diffchange diffchange-inline">horizontal.</del></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Considere <ins class="diffchange diffchange-inline">a máquina da figura constituida por duas roldanas </ins>de <ins class="diffchange diffchange-inline">inércia desprezável, duas massas </ins>\(<ins class="diffchange diffchange-inline">m_1</ins>\) <ins class="diffchange diffchange-inline">e </ins>\(<ins class="diffchange diffchange-inline">m_2</ins>\) <ins class="diffchange diffchange-inline">e um fio inextensível de massa desprezável.</ins></div></td></tr> <tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">Represente esquematicamente as forças que actuam no corpo</del>.</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">As massas encontram-se inicialmente em repouso e </ins>o <ins class="diffchange diffchange-inline">sistema encontra-se numa região com campo gravítico uniforme no sentido negativo </ins>do <ins class="diffchange diffchange-inline">eixo dos yy.</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">Sabendo </ins>que \(<ins class="diffchange diffchange-inline">m_1 = m_2 = m</ins>\)<ins class="diffchange diffchange-inline">, qual das seguintes afirmações é verdadeira:</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">a) O sistema permanece em repouso;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">b) A massa 1 sobe e </ins>a <ins class="diffchange diffchange-inline">massa 2 desce;</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">c) A massa 1 desce e a massa 2 sobe</ins>.</div></td></tr> </table>

Ist172693 http://www.mysolutions.tecnico.ulisboa.pt//wiki/index.php?title=M%C3%A1quina_com_duas_roldanas&diff=1079&oldid=prev 2016-04-06T08:53:54Z

<p>Criou a página com &quot;&lt;div class=&quot;toccolours mw-collapsible mw-collapsed&quot; style=&quot;width:420px&quot;&gt; &#039;&#039;&#039;Metadata&#039;&#039;&#039; &lt;div class=&quot;mw-collapsible-content&quot;&gt; *CONTEXTO : Primeiro ciclo universitário *AREA:...&quot;</p> <p><b>Página nova</b></p><div>&lt;div class=&quot;toccolours mw-collapsible mw-collapsed&quot; style=&quot;width:420px&quot;&gt;<br /> '''Metadata'''<br /> &lt;div class=&quot;mw-collapsible-content&quot;&gt;<br /> *CONTEXTO : Primeiro ciclo universitário<br /> *AREA: Física<br /> *DISCIPLINA: Mecânica e ondas<br /> *ANO: 1<br /> *LINGUA: pt<br /> *AUTOR: Ana Mourão<br /> *MATERIA PRINCIPAL: Interacção mecânica entre sistemas<br /> *DESCRICAO: Máquina com duas roldanas<br /> *DIFICULDADE: *<br /> *TEMPO MEDIO DE RESOLUCAO: 30 [s]<br /> *TEMPO MAXIMO DE RESOLUCAO: 180 [s]<br /> *PALAVRAS CHAVE: máquina, roldanas, constrangimentos, tensão, corda, inércia, desprezável<br /> &lt;/div&gt;<br /> &lt;/div&gt;<br /> <br /> [[File:Máquina_duas_roldanas.jpg|thumb|Máquina em questão]]<br /> <br /> Considere um corpo de massa \(m\) (g) que desliza no plano inclinado da figura. Existe atrito cinético \(\mu\) entre o corpo e a superfície do plano inclinado, sendo que esta superfície faz um ângulo \(\alpha\) com a horizontal.<br /> Represente esquematicamente as forças que actuam no corpo.</div>

Ist172693