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NASA’s Nuclear Frontier: The Plum Brook Reactor Facility
There are three main types of nuclear reactors: power, research, and test. Research and test reactors as scientific tools are more common than most people realize. While power reactors frequently appear in newspaper headlines and are conspicuous because of their size and power, research reactors can be quietly tucked away, even in the midst of a college campus. Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity. Research reactors operate at very low thermal power levels – so low, in fact, that they do not even require any type of forced cooling. They are used to measure nuclear parameters and other characteristics, which can then be used to build other reactors or to design experiments for test reactors. Test reactors are more powerful than research reactors and are able to produce much more intense radiation fields. Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system. This system will remove the heat from the reactor by transferring it to a secondary cooling system, which releases it into the atmosphere through cooling towers.
NASA’s Nuclear Frontier: The Plum Brook Reactor Facility. Pages 36 to 40.
Consider the sentence below taken from the text.
“Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity.”
It is correct to affirm that the word in bold and underlined above refers to
A soma dos ângulos internos de um triângulo qualquer é igual a 180°. Observe os ângulos internos do triângulo dados na figura abaixo.
Diante do exposto, assinale a alternativa que apresenta o
valor de x.
Considerando que a transcrição de trechos da resolução acima não foi fiel a alguns aspectos do texto original e com isso desrespeitou as normas de redação de documentos oficiais, assinale a opção correta.
1) I fazem parte da Coordenação das Organizações Indígenas da Amazônia Brasileira. II constituem barreiras contra a destruição da Amazônia. III ajudam a preservar milhões de hectares de florestas. IV colocam em risco o manejo de proteção à floresta amazônica. V necessitam de apoio para continuar a proteger a biodiversidade por mais tempo.
A quantidade de itens certos é igual a
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