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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.
Read the sentence below taken from the text.
“Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system.”
Choose the alternative that presents a word or expression that can susbtitute the bold and underlined one above, considering the context and without changing meaning.
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 words in bold and underlined in the following excerpts taken from the text.
I. “[...] power reactors frequently appear in newspaper headlines [...]”
II. “[...] research reactors can be quietly tucked away [...]”
III. “[...] which can easily be converted to other useable forms of energy [...]”
Choose the alternative in which the words in bold and underlined have the same grammar classification as the ones above.
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.
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.
According to the text, analyse the assertions below.
I. Power reactors are bigger than research reactors.
II. Research reactors generate more heat than power reactors.
III. Power reactors are more powerful than test or research reactors.
The correct assertion(s) is(are)
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.
Technology has created more jobs than it has destroyed
The battle between men and machines goes back centuries. Are they taking our jobs? Or are they easing our workload? A study by economists at the consultancy Deloitte seeks to shed new light on the relationship between jobs and the rise of technology by searching through census data for England and Wales going back to 1871. Their conclusion is that, rather than destroying jobs, technology has been a “great job-creating machine”. Findings by Deloitte such as rise in bar staff since the 1950s or a surge in the number of hairdressers this century suggest to the authors that technology has increased spending power, therefore creating new demand and new jobs. Their study argues that the debate has been twisted towards the job-destroying effects of technological change, which are more easily observed than its creative aspects. Going back over past figures paints a more balanced picture, say authors Ian Stewart and Alex Cole. “The dominant trend is of contracting employment in agriculture and manufacturing being more than balanced by rapid growth in the caring, creative, technology and business services sectors,” they write. “Machines will take on more repetitive and laborious tasks, but they seem no closer to eliminating the need for human labor than at any time in the last 150 years.” According to the study, hard, dangerous and dull jobs have declined. In some sectors, technology has quite clearly cost jobs, but they question whether they are really jobs we would want to hold on to. Technology directly substitutes human muscle power and, in so doing, raises productivity and shrinks employment. “In the UK the first sector to feel this effect on any scale was agriculture,” says the study. The study also found out that ‘caring’ jobs have increased. The report cites a “profound shift”, with labor switching from its historic role, as a source of raw power, to the care, education and provision of services to others. Technological progress has cut the prices of essentials, such as food, and the price of bigger household items such as TVs and kitchen appliances, notes Stewart. That leaves more money to spend on leisure, and creates new demand and new jobs, which may explain the big rise in bar staff, he adds. “_______ the decline in the traditional pub, census data shows that the number of people employed in bars rose fourfold between 1951 and 2011,” the report says. The Deloitte economists believe that rising incomes have allowed consumers to spend more on personal services, such as grooming. That in turn has driven employment of hairdressers. So, while in 1871 there was one hairdresser or barber for every 1,793 citizens of England and Wales; today there is one for every 287 people. (Adapted from: https://goo.gl/7V5vuw. Access: 02/02/2018.)
The use of the modal verb may in “which may explain the big rise in bar staff” (paragraph 6) indicates that
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