Foram encontradas 50 questões.
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
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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
Provas
Para responder às questões de números 47 e 48, leia o texto.
Petrobras" investments are guaranteed until 2013
SÃO PAULO, 6/30/09 — The financial and investor relations director of Brazilian mixed-capital oil giant Petrobras, Almir Barbassa, said Monday that the company's investment plan is guaranteed until 2013.
Barbassa also mentioned that the company has been cutting down on costs and investments in order to ensure the exploration of the subsalt reserves. The executive pointed out that Petrobras” operating costs fell by 30% in the final quarter of 2008.
“We are also trying to cut down the equipment that will be used in the subsalt platform and lower labor costs by investing in automation”, Barbassa added.
Petrobras already has over US$30 billion in financing for its future oil and gas exploration and refining and gas transport infrastructure projects. “Petrobras expects to produce 5.7 million barrels of oil equivalent a day (boed) by 2020”, he added.
The 2009 production target is 2.7 million boed.
(www.indexet.investimentosenoticias.com.br/arquivo/2009/06/30/26/Petrobras-investments-are-guaranteed-until-2013.html)
The term guaranteed in — Petrobras” investments are guaranteed until 2013 — means that the investments will be
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Para responder às questões de números 47 e 48, leia o texto.
Petrobras" investments are guaranteed until 2013
SÃO PAULO, 6/30/09 — The financial and investor relations director of Brazilian mixed-capital oil giant Petrobras, Almir Barbassa, said Monday that the company's investment plan is guaranteed until 2013.
Barbassa also mentioned that the company has been cutting down on costs and investments in order to ensure the exploration of the subsalt reserves. The executive pointed out that Petrobras” operating costs fell by 30% in the final quarter of 2008.
“We are also trying to cut down the equipment that will be used in the subsalt platform and lower labor costs by investing in automation”, Barbassa added.
Petrobras already has over US$30 billion in financing for its future oil and gas exploration and refining and gas transport infrastructure projects. “Petrobras expects to produce 5.7 million barrels of oil equivalent a day (boed) by 2020”, he added.
The 2009 production target is 2.7 million boed.
(www.indexet.investimentosenoticias.com.br/arquivo/2009/06/30/26/Petrobras-investments-are-guaranteed-until-2013.html)
According to the text,
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Os molinetes no campo da hidráulica servem para
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Um vertedouro triangular serve para determinar com precisão vazões reduzidas, utilizando a fórmula de Thomson:
Q=nH5/2
Qual a faixa de variação de n e qual o valor do ângulo 0 utilizado na prática para vertedouro triangular?
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Para o estudo das energias envolvidas no escoamento da água em sistemas hidráulicos, deve-se lembrar da equação de Bernoulli. Quais hipóteses (restrições) foram usadas para sua demonstração.
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A pressão no ponto:
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Um reservatório de 80 000 litros (0,80m de profundidade) está cheio de água. Determinar os esforços que atuam nas paredes laterais verticais e seu ponto de aplicação.
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Na seção transversal de um fluxo, num canal de seção transversal retangular, a velocidade está distribuída segundo a lei exponencial.
!$ V=V_{\max}\left(\dfrac{y}{h}\right)^{\dfrac{1}{9}} !$ .
Calcular a velocidade média para efeito de vazão.
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