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O coeficiente de Poisson de um material homogêneo e isótropo é 0,30 e o seu módulo de elasticidade longitudinal é igual a 180 GPa. Calcule o módulo de elasticidade transversal desse material.
Um pilar metálico rotulado nos seus extremos, com comprimento igual a 1,50 m e índice de esbeltez igual 85, é submetido à compressão centrada. Avalie as afirmativas a seguir:
I. O aumento da rigidez da sua seção transversal aumenta sua força crítica de flambagem.
II. A tensão crítica de flambagem depende apenas do seu comprimento.
III. A força crítica de flambagem depende apenas das condições de contorno do pilar.
Marque a resposta certa.
Calcular o alongamento de um tirante de aço com comprimento igual a 1,0 m e área da seção transversal igual a 60 milímetros quadrado, submetido a uma força de tração axial igual a 800 kN. Considerar o módulo de elasticidade longitudinal do aço igual a 210 GPa.
Leia o texto para responder às questões de números 49 e 50.
Food Supply Worries ofan Agricultural Scientist — Climate Change
People involved in world agriculture have no patience with the supposed “debate” about climate change. We are already seeing the effects, and the projections for the future are not encouraging.
The most troubling feature of this phenomenon (and one that occurs even if you don't believe that it is human-driven) is that we are facing increasing variation in climatic events. The yearly changes in average temperature or even annual rainfall may not be dramatic, but what we are anticipating is that there will be more extreme weather events.
(www.sustainablog.org/category/climate-change/01.10.2009. Adaptado)
The term but in — The yearly changes in average temperature or even annual rainfall may not be dramatic, but what we are anticipating is that there will be more extreme weather events. — is correctly replaced by
Leia o texto para responder às questões de números 49 e 50.
Food Supply Worries ofan Agricultural Scientist — Climate Change
People involved in world agriculture have no patience with the supposed “debate” about climate change. We are already seeing the effects, and the projections for the future are not encouraging.
The most troubling feature of this phenomenon (and one that occurs even if you don't believe that it is human-driven) is that we are facing increasing variation in climatic events. The yearly changes in average temperature or even annual rainfall may not be dramatic, but what we are anticipating is that there will be more extreme weather events.
(www.sustainablog.org/category/climate-change/01.10.2009. Adaptado)
According to the text, the phenomenon of climate change is
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