selecione os filtros para encontrar suas questões de concursos e clique no botão abaixo para filtrar e resolver.
Em alguns dispositivos médicos, onde há passagem de fluidos através de tubos plásticos para veias de pacientes, há necessidade de um detector de bolhas nos dutos. Uma das formas de se detectar bolhas é através da construção de um capacitor em que o tubo com o líquido passa entre as placas. Nesse dispositivo, a capacitância muda quando há mudança do material dentro do tubo, como durante a passagem de uma bolha. Suponha que a capacitância seja
Relacione, corretamente, as fases da mitose, com algumas das suas características, numerando os parênteses abaixo, de acordo com a seguinte indicação:
1.Prófase;
2. Metáfase;
3. Anáfase;
4. Telófase
( ) Os cromossomos se tornam visíveis e inicia a formação do fuso mitótico.
( ) Os centrômeros se alinham na placa equatorial.
( ) O envoltório nuclear e o nucléolo se refazem.
( ) As cromátides irmãs migram para polos opostos.
A sequência correta, de cima para baixo, é:
Associe corretamente os povos da mesopotâmia, apresentados a seguir, com suas respectivas características e/ou realizações, numerando a Coluna II de acordo com a Coluna I:
Coluna I
1. Sumérios
2. Babilônios
3. Assírios
4. Caldeus
Coluna II
( ) Atingiram seu apogeu em 587 a.C., quando Nabucodonosor conquistou Jerusalém.
( ) Eram excelentes construtores de canais de irrigação e desenvolveram a escrita cuneiforme.
( ) Desenvolveram um calendário preciso e registraram um código de leis.
( ) Consideravam a guerra a principal força social e desenvolveram uma cultura militar.
A sequência correta, de cima para baixo, é:
T E X T
Britain, Norway and the United States join forces with businesses to protect tropical forests.
Britain, Norway and the United States said Thursday they would join forces with some of the world’s biggest companies in an effort to rally more than $1 billion for countries that can show they are lowering emissions by protecting tropical forests. The goal is to make intact forests more economically valuable than they would be if the land were cleared for timber and agriculture.
The initiative comes as the world loses acre after acre of forests to feed global demand for soy, palm oil, timber and cattle. Those forests, from Brazil to Indonesia, are essential to limiting the linked crises of climate change and a global biodiversity collapse. They are also home to Indigenous and other forest communities. Amazon, Nestlé, Unilever, GlaxoSmithKline and Salesforce are among the companies promising money for the new initiative, known as the LEAF Coalition.
Last year, despite the global downturn triggered by the pandemic, tropical deforestation was up 12 percent from 2019, collectively wiping out an area about the size of Switzerland. That destruction released about twice as much carbon dioxide into the atmosphere as cars in the United States emit annually.
“The LEAF Coalition is a groundbreaking example of the scale and type of collaboration that is needed to fight the climate crisis and achieve net-zero emissions globally by 2050,” John Kerry, President Biden’s senior climate envoy, said in a statement. “Bringing together government and privatesector resources is a necessary step in supporting the large-scale efforts that must be mobilized to halt deforestation and begin to restore tropical and subtropical forests.”
An existing global effort called REDD+ has struggled to attract sufficient investment and gotten mired in bureaucratic slowdowns. This initiative builds on it, bringing private capital to the table at the country or state level. Until now, companies have invested in forests more informally, sometimes supporting questionable projects that prompted accusations of corruption and “greenwashing,” when a company or brand portrays itself as an environmental steward but its true actions don’t support the claim.
The new initiative will use satellite imagery to verify results across wide areas to guard against those problems. Monitoring entire jurisdictions would, in theory, prevent governments from saving forestland in one place only to let it be cut down elsewhere.
Under the plan, countries, states or provinces with tropical forests would commit to reducing deforestation and degradation. Each year or two, they would submit their results, calculating the number of tons of carbon dioxide reduced by their efforts. An independent monitor would verify their claims using satellite images and other measures. Companies and governments would contribute to a pool of money that would pay the national or regional government at least $10 per ton of reduced carbon dioxide.
Companies will not be allowed to participate unless they have a scientifically sound plan to reach net zero emissions, according to Nigel Purvis, the chief executive of Climate Advisers, a group affiliated with the initiative. “Their number one obligation to the world from a climate standpoint is to reduce their own emissions across their supply chains, across their products, everything,” Mr. Purvis said. He also emphasized that the coalition’s plans would respect the rights of Indigenous and forest communities.
From: www.nytimes.com/April 22, 2021
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