Magna Concursos

Foram encontradas 50 questões.

Considere as afirmações que se seguem, sobre as tendências aparentes que podem ser observadas na geração de energia elétrica no Brasil, a partir de dados disponíveis.

I - É esperado um decrescimento da geração térmica a gás natural, em virtude do aproveitamento do alto poder calorífico do carvão disponível no Brasil.

II - Se a geração a gás natural continuar, durante os próximos 15 anos, sua trajetória de crescimento nos mesmos percentuais anuais apresentados no Balanço Energético Nacional de 2005, a contribuição desse tipo de geração, em 2020, será maior que 50TWh.

III - As restrições ambientais que impedem a construção de novas grandes usinas hidrelétricas não deixam alternativas para o crescimento da geração hidrelétrica no Brasil.

É(São) correta(s) apenas a(s) afirmação(ões):

 

Provas

Questão presente nas seguintes provas
1805692 Ano: 2006
Disciplina: Geografia
Banca: CESGRANRIO
Orgão: EPE

Assinale a afirmação que apresenta dados corretos a respeito da geração nuclear no Brasil.

 

Provas

Questão presente nas seguintes provas

Considere as afirmações abaixo, que dizem respeito à geração térmica no Brasil.

I - Especificamente acerca das termelétricas a GLP, uma das vantagens da sua implementação no Brasil está relacionada à auto-suficiência nacional nesse tipo de combustível.

II - Segundo o Balanço Energético Nacional de 2005, a geração a gás natural continuou uma trajetória de crescimento no ano de 2004.

III - Uma das principais motivações para a expansão desse tipo de geração é o fato da tecnologia envolvida ser de domínio nacional.

É(São) correta(s) apenas a(s) afirmação(ões):

 

Provas

Questão presente nas seguintes provas
Acerca da utilização do biodiesel no Brasil, é correto afirmar que:
 

Provas

Questão presente nas seguintes provas
1805657 Ano: 2006
Disciplina: Física
Banca: CESGRANRIO
Orgão: EPE

Um circuito RC (Resistor-Capacitor) ligado em série é alimentado por uma fonte de tensão CC. Uma chave on-off, inicialmente desligada, conecta a fonte aos componentes. Estando o capacitor inicialmente descarregado, a partir do instante t=0, quando a chave é ligada, a expressão para o cálculo do tempo consumido até o capacitor se carregar com 20% da tensão da fonte é:

 

Provas

Questão presente nas seguintes provas
1805655 Ano: 2006
Disciplina: Física
Banca: CESGRANRIO
Orgão: EPE

enunciado 1805655-1

Para o circuito mostrado na figura, os valores de R, E1 e E2 , respectivamente, são:

 

Provas

Questão presente nas seguintes provas

Lança-se uma moeda não tendenciosa até a obtenção da segunda cara. Qual é a probabilidade de a moeda ser lançada cinco vezes?

 

Provas

Questão presente nas seguintes provas

Com os dados da tabela abaixo, quanto vale o índice de preços de Laspeyres de 2005 com base (igual a 100) em 2004?

2004

2005

Produtos

Preço corrente Quantidade Preço corrente

Quantidade

Arroz

5 10 7 5

Feijão

8 20 10 25
 

Provas

Questão presente nas seguintes provas

Books are being scanned to make them searchable

on the Internet. Television broadcasts are being recorded

and archived for online posterity. Radio shows, too, are

getting their digital conversion — to podcasts. With a

few keystrokes, we’ll soon be able to make good use of

much of the world’s knowledge. And we’ll do it from nearly

anywhere — already, newer iPods can carry all your

music, digital photos and TV classics along with more

contemporary prime-time fare.

Will all this instantly accessible information make

us much smarter, or simply more stressed? When can

we stop to think, absorb and evaluate all this data?

“People are already struggling and feeling like they need

to keep up with the variety of information sources they

already have,” said David Greenfield, a psychologist who

wrote Virtual Addiction. “There are upper limits to how

much we can manage.”

It may take better technology to cope with the

problems better technology creates. Of course, if used

properly, the new resources have vast potential to shape

how we live, study and think. Consider books. Nicole

Quaranta, 22, is a typical youth. The New York University

grad student in education does most of her research

online. She’ll check databases for academic journals

and newspaper articles — but rarely books, even though

she admits that an author who spent years on a 300-

page book might have a unique perspective. “The library

is intimidating because I have to go there and everything

is organized by academic area,” Quaranta said. “I don’t

even know where to begin.” Were books as easily

searchable as Web pages, she would reconsider.

Otherwise, they might as well not exist.

With a generation growing up expecting everything

on the Internet, libraries, non-profit organizations and

leading search companies like Yahoo and Microsoft are

committing hundreds of millions of dollars collectively

to scan books and other printed materials so they can

be indexed and retrieved online. […]

Meanwhile, television shows formerly locked up in

network or studio vaults are starting to emerge online.

“Before, once it has been broadcast, it’s gone, and it doesn’t

really contribute to our knowledge space,” said Jakob

Nielsen, a Web design expert with Nielsen Norman Group.

For the past year, Google has been digitally recording

news and other programs from several TV stations in

the San Francisco area. Early next year, America Online

and Warner Bros. will offer free access to dozens of old

television shows, and Apple Computer recently started

selling episodes of shows old and new from ABC and

NBC Universal for .99 each — viewable on computers

and its newer iPods.

In audio, National Public Radio has been producing

free podcasts featuring clips or entire programs. Anyone

with a music player can listen anytime, anywhere.

And then there are materials born digital: Photos

from digital cameras can now be easily shared, even

among strangers, at sites like Yahoo’s Flickr.

Steve Jones, a professor of communications at the

University of Illinois at Chicago, says centralization and

easy access could make people smarter: Instead of

wasting time finding information, they can focus more

on assessing its worth. But there’s the danger, he says,

that people will simply take information for granted:

Assuming that whatever pops up first is the best. Worse,

people may simply tune out.

The key may lie in technologies that push to the

top items you seek. Search analyst Danny Sullivan

describes such a tool as “some sort of metal detector

or magnet to pull all the good stuff out of the haystack.”

Virtual communities may contribute to that end. […]

“Social networks, search engines and things yet

invented are critical as we bring millions of movies, books

and musical recordings online,” said Brewster Kahle, a

search pioneer who created the Internet Archive, a non-

profit preservation group.

Even more important will be good research skills

— infoliteracy, if you will. That means knowing where

and how to look, and evaluating what you get back. […]

By Anick Jesdanun, Associated Press. Dec. 25, 20

There are several ways to avoid the stress caused by instantly accessible information online (lines 58-78), EXCEPT to:

 

Provas

Questão presente nas seguintes provas

Books are being scanned to make them searchable

on the Internet. Television broadcasts are being recorded

and archived for online posterity. Radio shows, too, are

getting their digital conversion — to podcasts. With a

few keystrokes, we’ll soon be able to make good use of

much of the world’s knowledge. And we’ll do it from nearly

anywhere — already, newer iPods can carry all your

music, digital photos and TV classics along with more

contemporary prime-time fare.

Will all this instantly accessible information make

us much smarter, or simply more stressed? When can

we stop to think, absorb and evaluate all this data?

“People are already struggling and feeling like they need

to keep up with the variety of information sources they

already have,” said David Greenfield, a psychologist who

wrote Virtual Addiction. “There are upper limits to how

much we can manage.”

It may take better technology to cope with the

problems better technology creates. Of course, if used

properly, the new resources have vast potential to shape

how we live, study and think. Consider books. Nicole

Quaranta, 22, is a typical youth. The New York University

grad student in education does most of her research

online. She’ll check databases for academic journals

and newspaper articles — but rarely books, even though

she admits that an author who spent years on a 300-

page book might have a unique perspective. “The library

is intimidating because I have to go there and everything

is organized by academic area,” Quaranta said. “I don’t

even know where to begin.” Were books as easily

searchable as Web pages, she would reconsider.

Otherwise, they might as well not exist.

With a generation growing up expecting everything

on the Internet, libraries, non-profit organizations and

leading search companies like Yahoo and Microsoft are

committing hundreds of millions of dollars collectively

to scan books and other printed materials so they can

be indexed and retrieved online. […]

Meanwhile, television shows formerly locked up in

network or studio vaults are starting to emerge online.

“Before, once it has been broadcast, it’s gone, and it doesn’t

really contribute to our knowledge space,” said Jakob

Nielsen, a Web design expert with Nielsen Norman Group.

For the past year, Google has been digitally recording

news and other programs from several TV stations in

the San Francisco area. Early next year, America Online

and Warner Bros. will offer free access to dozens of old

television shows, and Apple Computer recently started

selling episodes of shows old and new from ABC and

NBC Universal for .99 each — viewable on computers

and its newer iPods.

In audio, National Public Radio has been producing

free podcasts featuring clips or entire programs. Anyone

with a music player can listen anytime, anywhere.

And then there are materials born digital: Photos

from digital cameras can now be easily shared, even

among strangers, at sites like Yahoo’s Flickr.

Steve Jones, a professor of communications at the

University of Illinois at Chicago, says centralization and

easy access could make people smarter: Instead of

wasting time finding information, they can focus more

on assessing its worth. But there’s the danger, he says,

that people will simply take information for granted:

Assuming that whatever pops up first is the best. Worse,

people may simply tune out.

The key may lie in technologies that push to the

top items you seek. Search analyst Danny Sullivan

describes such a tool as “some sort of metal detector

or magnet to pull all the good stuff out of the haystack.”

Virtual communities may contribute to that end. […]

“Social networks, search engines and things yet

invented are critical as we bring millions of movies, books

and musical recordings online,” said Brewster Kahle, a

search pioneer who created the Internet Archive, a non-

profit preservation group.

Even more important will be good research skills

— infoliteracy, if you will. That means knowing where

and how to look, and evaluating what you get back. […]

By Anick Jesdanun, Associated Press. Dec. 25, 20

In "Virtual communities may contribute to that end." (line 70), the word that could replace may without changing the meaning of the sentence is:

 

Provas

Questão presente nas seguintes provas