Desafio Nota Máxima - Mecânica dos sólidos - Cola na Rede

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segunda-feira, 23 de outubro de 2017

Desafio Nota Máxima - Mecânica dos sólidos

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1 // (ID 248274) 
CONHECIMENTOS BÁSICOS DE ENGENHARIA > MECÂNICA DOS SÓLIDOS
50 PONTOS443 SEGUNDOS

Uma viga homogênea AB de peso 1 kN e comprimento L, recebe uma carga de 4 kN concentrada em seu ponto médio, enquanto é sustentada por dois apoios, um em A e outro em B, como mostra a figura.
.com/blogger_img_proxy/
Fonte: o autor.

Julgue as afirmações:

I. a força cortante é constante e atinge o valor máximo de 5 kN.
II. o momento fletor é nulo nos pontos A e B.
III. o momento fletor atinge o valor máximo no ponto médio da viga.

É correto o que se afirma em:
  • II e III.
  • I, II e III.
  • I.
  • II.
  • III.

Resolução da questão

Veja abaixo o comentário da questão:
Pelas condições de equilíbrio:
data:image/png;base64,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  
este momento em relação à A.
Tomando uma seção imaginária entre A e o ponto médio, retira-se o segmento:
.com/blogger_img_proxy/
Fonte: o autor.
Vê-se que data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALMAAAAYCAYAAACxz8zeAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAMyZLetQAAAxlJREFUeNrtmsFrE0EUxpciJYgIoQeRHAQpUiSIICVI8FAopUgRKRQpHjwI4lFE8CDiqbci0oMQREIPEggliIgXKVKkiOBBiogI/gG9lOKhlBCI79UvMC4zm8lkd2Zt3w8+2MxMZ/ft23nvzdAo+kuVtEb6TWqTvpJuRnZ0E5QFH0kXDX2TePY0OUl6TvoM1dCWNT7tDOn/PdKIxbhd0i2bOTZIi6QT+H2etIk2G2N8UifdMPStk6ZTvh/PeU35PYe2w2RnKP+Pk7Ysx33HAnea44zljXx/zLw6n2rar5A+pHyvBdKKpv2ZpaP/FztD+f86qWE57hVplXTOcY5oP4cfMzuzpWn/RLqQ8r049c5o2qfQNyiPEUnyZmco/z8hPcT1MXysVxPG8XtfSpjDyGWkmrx9zGz0TqxtFivXpa5Lqu/4PqOadm7bdnj2BurSxZzZGcr/TUTWAq6n+oyLNM+k9mkpYLNTtTSmDSe9I91Xaq+s+IFn7PEFaTFtOgl9bYf5TuFZ+Z29iNkQ0s5Q/v9JKpPekCp9xpWUSDwde0cl0x8WSa8N6bVfJLmEVMo3mMgwgjSUdMR17XJGTu04pODuAGrmxE7f/o9w+rCHsqlsMU6t5VcNff9wFoaMD/lCZrBDzooHpLu45ggyNsTxUdLi2TaUGQXHMkONzDXD3CHsDOH/CjayXHK9tBin8h7Rv2LaDE8g9R33uHlwZQ6rk3f8jzK8zxrqVJ2zXDaAg9TMPu0M4X9+B3VcLyuLNmmcetJzx9B3EDGaSBVpwGnjV4YvfgzpadOi7hyGeTg4Tj1yO5ob5DTDp50h/L+CD1KNtlXDuNuaDfi6Zo4D3lrUOL3I0o3tHlvY+Y5AszBkPuNIsqszJAM4jd2Do0cRITcif/iwM4T/W7FjuCJKqdN9xvXgILOl67OtsXTGLGC32cFREq/wSQ9OXvL0MRVR0+1js1HzcFrj284Q/t/RZJsyIm6hz7gIUbw7bMZqGFaKcDQ4NP7nf3z5lmJtJYj/g1HCZkE4moj/, enquanto o momento fletor varia com a distância de acordo com data:image/png;base64,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.
Para uma seção efetuada entre o ponto médio e B:
.com/blogger_img_proxy/
Fonte: o autor.
Tem-se que:
data:image/png;base64,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 
Repare que, nas fórmulas dos momentos fletores, eles se anulam nas extremidades e atingem o valor máximo no ponto médio, em 0,5L:
data:image/png;base64,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

Comentário da sua resposta:

Colocamos abaixo uma breve explicação sobre a alternativa que você marcou errada:
  • Pelas condições de equilíbrio:
    data:image/png;base64,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  
    este momento em relação à A.
    Tomando uma seção imaginária entre A e o ponto médio, retira-se o segmento:
    .com/blogger_img_proxy/
    Fonte: o autor.
    Vê-se que data:image/png;base64,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, enquanto o momento fletor varia com a distância de acordo com data:image/png;base64,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.
    Para uma seção efetuada entre o ponto médio e B:
    .com/blogger_img_proxy/
    Fonte: o autor.
    Tem-se que:
    data:image/png;base64,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 
    Repare que, nas fórmulas dos momentos fletores, eles se anulam nas extremidades e atingem o valor máximo no ponto médio, em 0,5L:
    data:image/png;base64,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

2 // (ID 8240) 
CONHECIMENTOS BÁSICOS DE ENGENHARIA > MECÂNICA DOS SÓLIDOS
50 PONTOS85 SEGUNDOS

Verifique a figura a seguir e identifique as camadas da Terra que ela representa e, na sequência, identifique qual das alternativas traz a associação correta dessas camadas.

.com/blogger_img_proxy/
  • I - Crosta, II - Núcleo externo, III - Manto e IV - Núcleo interno.
  • I - Núcleo externo, II - Núcleo interno, III – Manto e IV - Crosta.
  • I - Crosta, II - Manto, III - Núcleo externo e IV – Núcleo Interno.
  • I - Núcleo interno, II - Núcleo externo, III – Manto e IV - Crosta.
  • I - Núcleo interno, II - Manto, III - Núcleo externo e IV - Crosta.

Resolução da questão

Veja abaixo o comentário da questão:
O aluno deve observar a identificação na figura das camadas. Trata-se de uma questão de compreensão, que transforma a informação da figura em resposta.
De acordo com a sequência de identificação da figura, a resposta correta é: 
I - Núcleo interno, II - Manto, III - Núcleo externo e IV - Crosta.
.com/blogger_img_proxy/

3 // UDESC (ID 8227) 
CONHECIMENTOS BÁSICOS DE ENGENHARIA > MECÂNICA DOS SÓLIDOS
50 PONTOS2131 SEGUNDOS

(UDESC) A Teoria da Deriva dos Continentes foi enunciada pelo cientista alemão Alfred Lothar Wegener, em 1912. Segundo este autor a Terra teria sido formada inicialmente por um único e enorme supercontinente que foi se fragmentando e se deslocando continuamente desde o período Mesozóico, como se fosse uma espécie de nata flutuando sobre um magma semilíquido e passeando em diferentes direções. Assinale a alternativa CORRETA que contém o nome com o qual foi batizado este supercontinente inicial.
  • Folhelhos de Wegener
  • Riftis
  • Pangéia
  • Gaia
  • Placas Tectônicas


4 // PUCMG (ID 8232) 
CONHECIMENTOS BÁSICOS DE ENGENHARIA > MECÂNICA DOS SÓLIDOS
50 PONTOS135 SEGUNDOS

.com/blogger_img_proxy/

(PUCMG) A análise da figura, que representa as principais placas tectônicas do globo terrestre, está INCORRETAMENTE expressa em:
  • A bacia do Pacífico encontra-se circundada por margens continentais passivas.
  • O movimento contínuo das placas provoca, em tempo geológico, a formação de supercontinentes. 
  • As placas tectônicas movimentam-se sobre o manto terrestre provocando choques, divergências ou movimentos paralelos entre si.
  • Movimentos divergentes entre placas podem conduzir à abertura de bacias oceânicas.

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