← Voltar para a lista de provas Marinha do Brasil · Oficial dos Quadros Complementares (CP-QC-CA-FN/2025) — Máquinas 51 questões nesta prova · página 1 de 3 · 48 com gabarito Gabarito disponível Gabarito disponível Verdadeiro/falso sobre o Text I. 1) V: o texto diz que a corrente é a mais forte do planeta, 5 vezes mais forte que a Corrente do Golfo e mais de 100 vezes mais forte que o rio Amazonas. 2) V: ela mantém a água quente afastada, protege as camadas de gelo e é uma barreira a espécies invasoras. 3) F: ela conecta os oceanos Pacífico, Atlântico e Índico, não 'apenas' Pacífico e Índico. 4) V: as consequências de um enfraquecimento são profundas porque a corrente tem papel crucial no ecossistema antártico. A sequência é V, V, F, V. As demais opções erram ao marcar falsa a 2ª ou a 4ª afirmativa, ou verdadeira a 3ª, que restringe os oceanos conectados a apenas dois. Referência: Text I (BBC Future, 2025), parágrafos 1, 2 e 4. Resolução comentada do VaiConcursos. Gabarito disponível Gabarito disponível Uso incorreto de modal: 'May you follow...?' como pergunta. Para perguntar sobre obrigação ou possibilidade, usa-se 'Must/Should/Can you...?'. 'May you follow the present legislation?' soa incorreto, porque 'may' em pergunta pede permissão ou desejo (ex.: 'May I come in?'). Por isso a C é o uso inadequado. A) 'should' indica expectativa, o que é correto. B) 'might' indica possibilidade, o que é correto. D) 'should' indica expectativa, e a frase aparece no texto. E) 'couldn't' indica incapacidade no passado, o que é correto. Referência: Verbos modais (should, might, may, could) em inglês. Resolução comentada do VaiConcursos. Gabarito disponível Questão anulada Gabarito disponível 'Whether' expressa incerteza/dúvida. 'Whether' introduz uma oração subordinada indireta de dúvida ('se'). No trecho, a HERA quer descobrir se a técnica poderia ser eficaz, o que indica algo ainda incerto. A) conclusão seria 'therefore' ou 'thus'. B) resultado seria 'so' ou 'as a result'. C) tempo seria 'when' ou 'while'. D) contraste seria 'but', 'however' ou 'although'. Referência: Conjunções e conectivos em inglês: whether = if (dúvida). Resolução comentada do VaiConcursos. Gabarito disponível Paráfrase de oração condicional tipo 1 (real/futura). A oração original, 'If approved by the council, the mission will launch in 2028', é uma condicional do tipo 1 (if + presente, will + verbo). A opção A mantém essa estrutura na voz ativa e conserva o sentido: 'If the council approves..., it will launch in 2028'. B) 'would' depois de 'if' é incorreto na condicional tipo 1. C) 'approved' (passado) com 'will' mistura estruturas. D) 'would launched' é gramaticalmente errado (falta 'be' e o particípio). E) 'will approve' depois de 'if' e 'would have been launched' formam uma estrutura incoerente. Referência: Condicional tipo 1 (First Conditional) em inglês. Resolução comentada do VaiConcursos. Gabarito disponível A paráfrase correta em voz passiva no passado é a B. A frase original está na voz ativa e no passado simples. A voz passiva correspondente é 'The planet's gravity was used by the spacecraft to get a kick', mantendo o tempo verbal e o sentido. A) Passiva no presente contínuo, tempo diferente. C) e D) Alteram o sentido e os sujeitos. E) 'was used for the spacecraft to get' muda a estrutura e não preserva o agente nem a construção original. Referência: Gramática da língua inglesa: voz passiva. Resolução comentada do VaiConcursos. Gabarito disponível O objetivo principal da HERA é investigar o local da colisão histórica com o asteroide. O texto diz que a sonda estava a caminho de 'investigate the scene of a historic asteroid collision' e que a missão busca descobrir o impacto causado pela sonda da NASA. Esse é o objetivo principal. A) As imagens de Deimos foram uma oportunidade durante o percurso. B) Apophis é alvo de outra missão, a Ramses. D) O teste de instrumentos foi feito em Marte, por oportunidade. E) Dimorphos é o foco após a passagem por Marte, mas a questão pede o objetivo da missão, que é investigar a colisão histórica. Referência: Texto II (VOA News/AFP, 13/03/2025). Resolução comentada do VaiConcursos. Gabarito disponível Lubrificação hidrostática: filme espesso criado por fluido pressurizado externamente. Segundo Shigley, a lubrificação hidrostática é obtida introduzindo lubrificante (às vezes ar ou água) na área de carga sob pressão suficiente para separar as superfícies. Por isso não depende do movimento relativo entre elas. A) Hidrodinâmica: o filme se forma pelo movimento relativo das superfícies. B) Elasto-hidrodinâmica: ocorre em contatos com deformação elástica, como engrenagens e rolamentos. D) Limítrofe (contorno): filme muito fino, com contato parcial. E) Película sólida: usa lubrificantes sólidos como grafite e MoS2. Referência: Shigley, Projeto de Engenharia Mecânica (2016). Resolução comentada do VaiConcursos. Gabarito disponível Gabarito disponível Tampões, bujões e flanges cegos fecham a extremidade do tubo. Tampão (cap), bujão (plug) e flange cego têm a função de fechar a extremidade de tubulações. Só a alternativa A traz exclusivamente conexões com essa finalidade. B) Joelhos de redução e cruzetas de redução não fecham extremidade. C) Reduções concêntricas e curvas de raio longo apenas mudam diâmetro ou direção. D) Niples são peças de ligação, não de fechamento. E) Curvas, joelhos e selas não fecham extremidade. Referência: Telles, Tubulações Industriais. Resolução comentada do VaiConcursos. Gabarito disponível Eficiência de Carnot: η = 1 − Tf/Tq = 60%. Convertendo para kelvin, Tq = 477 + 273 = 750 K e Tf = 27 + 273 = 300 K. Então η = 1 − 300/750 = 1 − 0,4 = 0,6, ou seja, 60%. 30%, 40%, 50% e 70% não resultam de 1 − Tf/Tq. Usar a temperatura em °C ou outro par de temperaturas é o erro típico que leva a esses valores. Referência: Çengel e Boles, Termodinâmica (ciclo de Carnot). Resolução comentada do VaiConcursos. Gabarito disponível Gabarito disponível As válvulas angulares são variantes das válvulas de globo. A válvula angular tem o mesmo princípio de funcionamento da válvula de globo (obturador que se move perpendicularmente à sede), mas com entrada e saída a 90°. Portanto é uma variante da de globo. A) Errada: volante, alavanca e engrenagens são operação manual; a motorizada usa motores, atuadores etc. C) Errada: corrosão, erosão e sólidos são fatores relevantes na seleção. D) Errada: válvula de macho e de agulha são tipos distintos. E) Errada: a de globo é de regulagem (estrangulamento), embora possa também bloquear; a de diafragma é de bloqueio e regulagem, e a questão afirma ambas como bloqueio, o que o gabarito não adota. Referência: Telles, Tubulações Industriais: Materiais, Projeto e Montagem. Resolução comentada do VaiConcursos. Gabarito disponível Gabarito disponível Gabarito disponível A recirculação de líquido exige maior carga de refrigerante. Segundo Jabardo, uma desvantagem da recirculação de líquido é a maior carga de refrigerante, pois evaporadores e linhas até o separador de líquido ficam com fração de líquido muito superior à da expansão direta. A, B, C e D são vantagens ou características favoráveis do sistema: uso mais eficiente da superfície, remoção de óleo em local único, válvulas recebendo líquido a pressão constante e remoção do gás de flash na sala de máquinas. Referência: Jabardo, Sistemas de refrigeração (2002). Resolução comentada do VaiConcursos. Gabarito disponível O eletrodo de tungstênio (TIG) concentra o calor em área muito pequena. No processo TIG o eletrodo de tungstênio não se consome e suporta altas temperaturas, produzindo um arco muito concentrado. Isso permite concentrar o calor da soldagem numa área pequena. A) Errada: o arco submerso usa fluxo granular, não gasoso. B) Errada: no eletrodo revestido a proteção vem da escória e também dos gases gerados pela queima do revestimento. D) Errada: na brasagem os metais base não fundem, só o metal de adição. E) Errada: a soldagem por resistência gera calor pelo efeito Joule; o calor por atrito é característico de outros processos. Referência: Marques, Modenesi e Bracarense, Soldagem: Fundamentos e Tecnologia. Resolução comentada do VaiConcursos.Marinha do Brasil — CP-QC-CA-FN/2025 — Máquinas — Prova Amarela
TEXT I
The world's strongest ocean current should be getting faster - instead, it is at risk of failing.
Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050? The Antarctic Circumpolar Current is the strongest ocean current on the planet. It's five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River. It forms part of the global ocean "conveyor belt" connecting the Pacific, Atlantic and Indian oceans. The system regulates Earth's climate and pumps water, heat and nutrients around the globe. But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.
The Antarctic Circumpolar Current is like a moat around the icy continent. The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating the Earth's climate.
The influence of climate change:
Ocean currents respond to changes in temperature, salt levels, wind patterns and sea ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts. Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse. Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current.
Far-reaching consequences:
The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching. As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem. Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.
(Adapted from: www.bbcnews/fuure/article/20250303-the-worlds-strongest-ocean-current-is-at-risck)
According to the excerpt below, mark the correct conjunction that can be replaced for another, without changing the meaning of the text.
TEXT I
The world's strongest ocean current should be getting faster - instead, it is at risk of failing.
Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050? The Antarctic Circumpolar Current is the strongest ocean current on the planet. It's five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River. It forms part of the global ocean "conveyor belt" connecting the Pacific, Atlantic and Indian oceans. The system regulates Earth's climate and pumps water, heat and nutrients around the globe. But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.
The Antarctic Circumpolar Current is like a moat around the icy continent. The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating the Earth's climate.
The influence of climate change:
Ocean currents respond to changes in temperature, salt levels, wind patterns and sea ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts. Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse. Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current.
Far-reaching consequences:
The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching. As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem. Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.
(Adapted from: www.bbcnews/fuure/article/20250303-the-worlds-strongest-ocean-current-is-at-risck)
Read the excerpts about the Text I and establish if the statements are true or false and mark the correct answer.
( ) The Antarctic Circumpolar Current is the strongest on the planet and it's stronger than the Gulf Stream and the Amazon River.
( ) The current helps to keep warm water at bay, protecting even vulnerable ice sheets, as also acts as a kind of barrier to invasive species.
( ) It forms part of the global ocean "conveyor belt" a specie of continuous movement and connecting only Pacific and Indian oceans.
( ) There is a complex concern about the consequences of a weaker Antarctic Circumpolar Current, because it plays a crucial role in the Antarctic ecosystem.Resolução comentada
Análise das alternativas
TEXT I
The world's strongest ocean current should be getting faster - instead, it is at risk of failing.
Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050? The Antarctic Circumpolar Current is the strongest ocean current on the planet. It's five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River. It forms part of the global ocean "conveyor belt" connecting the Pacific, Atlantic and Indian oceans. The system regulates Earth's climate and pumps water, heat and nutrients around the globe. But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.
The Antarctic Circumpolar Current is like a moat around the icy continent. The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating the Earth's climate.
The influence of climate change:
Ocean currents respond to changes in temperature, salt levels, wind patterns and sea ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts. Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse. Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current.
Far-reaching consequences:
The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching. As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem. Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.
(Adapted from: www.bbcnews/fuure/article/20250303-the-worlds-strongest-ocean-current-is-at-risck)
Mark the statement which presents the correct use of prepositions.
TEXT I
The world's strongest ocean current should be getting faster - instead, it is at risk of failing.
Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050? The Antarctic Circumpolar Current is the strongest ocean current on the planet. It's five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River. It forms part of the global ocean "conveyor belt" connecting the Pacific, Atlantic and Indian oceans. The system regulates Earth's climate and pumps water, heat and nutrients around the globe. But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.
The Antarctic Circumpolar Current is like a moat around the icy continent. The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating the Earth's climate.
The influence of climate change:
Ocean currents respond to changes in temperature, salt levels, wind patterns and sea ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts. Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse. Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current.
Far-reaching consequences:
The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching. As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem. Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.
(Adapted from: www.bbcnews/fuure/article/20250303-the-worlds-strongest-ocean-current-is-at-risck)
Mark the option that presents an INCORRECT use of a modal verb.Resolução comentada
Análise das alternativas
TEXT I
The world's strongest ocean current should be getting faster - instead, it is at risk of failing.
Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050? The Antarctic Circumpolar Current is the strongest ocean current on the planet. It's five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River. It forms part of the global ocean "conveyor belt" connecting the Pacific, Atlantic and Indian oceans. The system regulates Earth's climate and pumps water, heat and nutrients around the globe. But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.
The Antarctic Circumpolar Current is like a moat around the icy continent. The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating the Earth's climate.
The influence of climate change:
Ocean currents respond to changes in temperature, salt levels, wind patterns and sea ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts. Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse. Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current.
Far-reaching consequences:
The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching. As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem. Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.
(Adapted from: www.bbcnews/fuure/article/20250303-the-worlds-strongest-ocean-current-is-at-risck)
![Texto: By reading the text: "[...] spreading them out as they drift towards the continent.", it is correct to infer that the meaning of the underlined term is similar to: — com as palavras "spreading" e "out" sublinhadas.](https://vaiconcursos.com/wp-content/uploads/questoes-v4/imagens/b7287d6c7f913d00c933c9c94a08d7f8a238c51f61ba7599bdbe30994ac46908/q005_img_01.png)
TEXT II
TITLE: Asteroid probe snaps rare images of Martian Moon
March 13, 2025 3:29 PM
By Agence France-Press
Paris -
On the way to investigate the scene of a historic asteroid collision, a European spacecraft swung by Mars and captured rare images of the red planet's mysterious small moon Deimos, the European Space Agency said Thursday.
Europe's HERA mission is aiming to find out how much of an impact a NASA spacecraft made when it deliberately smashed into an asteroid in 2022 in the first test of our planetary defenses.
But HERA will not reach the asteroid - which is 11 million kilometers from Earth in the asteroid belt between Mars and Jupiter - until late 2026.
On the long voyage there, the spacecraft swung around Mars on Wednesday.
The spacecraft used the planet's gravity to get a "kick" that also changed its direction and saved fuel, mission analyst Pablo Munoz told a press conference.
For an hour, HERA flew as close as 5,600 kilometers from the Martian surface, at a speed of 33,480 kilometers an hour.
It used the opportunity to test some of its scientific instruments, snapping around 600 pictures, including rare ones of Deimos.
The lumpy, 12.5-kilometer-wide moon is the smaller and less well-known of the two moons of Mars.
Exactly how Deimos and the bigger Phobos were formed remains a matter of debate.
Some scientists believe they were once asteroids that were captured in the gravity of Mars, while others think they could have been shot from a massive impact on the surface.
The new images add "another piece of the puzzle" to efforts to determine their origin, Marcel Popescu of the Astronomical Institute of the Romanian Academy said.
There are hopes that data from HERA's "HyperScout" and thermal infrared imagers - which observe colors beyond the limits of the human eye - will shed light on this mystery by discovering more about the moon's composition.
Those infrared imagers are why the red planet appears blue in some of the photos.
Next, HERA will turn its focus back to asteroid Dimorphos.
When NASA's DART mission smashed into Dimorphos in 2022, it shortened the 160-meter-wide asteroid's orbit around its big brother Didymos by 33 minutes.
Although Dimorphos itself posed no threat to Earth, HERA intends to discover whether this technique could be an effective way for Earth to defend itself against possibly existence-threatening asteroids in the future.
Space agencies have been working to ramp up Earth's planetary defences, monitoring for potential threats so they can be dealt with as soon as possible.
Earlier this year, a newly discovered asteroid capable of destroying a city was briefly given a more than 3% chance of hitting Earth in 2032.
However further observations sent the chances of a direct hit back down to nearly zero.
Richard Moissl, head of the ESA's planetary defense office, said that asteroid, 2024 YR, followed a pattern that will become more common.
As we get better at scanning the skies, "we will discover asteroids at a higher rate," he said.
The ESA is developing a secondary planetary defense mission to observe the 350-meter-wide asteroid Apophis, which will fly just 32,000 kilometers from Earth on April 13, 2029.
If approved by the ESA's ministerial council, the Ramses mission will launch in 2028, reaching the asteroid two months before it approaches Earth.
(Adapted from: https://www.voanews.com/a/asteroid-probe-snaps-rare-images-of-martian-moon/8009850.html )
HERA, DART and RAMSES are proper nouns used to identify:
TEXT II
TITLE: Asteroid probe snaps rare images of Martian Moon
March 13, 2025 3:29 PM
By Agence France-Press
Paris -
On the way to investigate the scene of a historic asteroid collision, a European spacecraft swung by Mars and captured rare images of the red planet's mysterious small moon Deimos, the European Space Agency said Thursday.
Europe's HERA mission is aiming to find out how much of an impact a NASA spacecraft made when it deliberately smashed into an asteroid in 2022 in the first test of our planetary defenses.
But HERA will not reach the asteroid - which is 11 million kilometers from Earth in the asteroid belt between Mars and Jupiter - until late 2026.
On the long voyage there, the spacecraft swung around Mars on Wednesday.
The spacecraft used the planet's gravity to get a "kick" that also changed its direction and saved fuel, mission analyst Pablo Munoz told a press conference.
For an hour, HERA flew as close as 5,600 kilometers from the Martian surface, at a speed of 33,480 kilometers an hour.
It used the opportunity to test some of its scientific instruments, snapping around 600 pictures, including rare ones of Deimos.
The lumpy, 12.5-kilometer-wide moon is the smaller and less well-known of the two moons of Mars.
Exactly how Deimos and the bigger Phobos were formed remains a matter of debate.
Some scientists believe they were once asteroids that were captured in the gravity of Mars, while others think they could have been shot from a massive impact on the surface.
The new images add "another piece of the puzzle" to efforts to determine their origin, Marcel Popescu of the Astronomical Institute of the Romanian Academy said.
There are hopes that data from HERA's "HyperScout" and thermal infrared imagers - which observe colors beyond the limits of the human eye - will shed light on this mystery by discovering more about the moon's composition.
Those infrared imagers are why the red planet appears blue in some of the photos.
Next, HERA will turn its focus back to asteroid Dimorphos.
When NASA's DART mission smashed into Dimorphos in 2022, it shortened the 160-meter-wide asteroid's orbit around its big brother Didymos by 33 minutes.
Although Dimorphos itself posed no threat to Earth, HERA intends to discover whether this technique could be an effective way for Earth to defend itself against possibly existence-threatening asteroids in the future.
Space agencies have been working to ramp up Earth's planetary defences, monitoring for potential threats so they can be dealt with as soon as possible.
Earlier this year, a newly discovered asteroid capable of destroying a city was briefly given a more than 3% chance of hitting Earth in 2032.
However further observations sent the chances of a direct hit back down to nearly zero.
Richard Moissl, head of the ESA's planetary defense office, said that asteroid, 2024 YR, followed a pattern that will become more common.
As we get better at scanning the skies, "we will discover asteroids at a higher rate," he said.
The ESA is developing a secondary planetary defense mission to observe the 350-meter-wide asteroid Apophis, which will fly just 32,000 kilometers from Earth on April 13, 2029.
If approved by the ESA's ministerial council, the Ramses mission will launch in 2028, reaching the asteroid two months before it approaches Earth.
(Adapted from: https://www.voanews.com/a/asteroid-probe-snaps-rare-images-of-martian-moon/8009850.html )
In the extract: "...HERA intends to discover whether this technique could be an effective way for Earth to defend itself...", the word WHETHER conveys the idea of:Resolução comentada
Análise das alternativas
TEXT II
TITLE: Asteroid probe snaps rare images of Martian Moon
March 13, 2025 3:29 PM
By Agence France-Press
Paris -
On the way to investigate the scene of a historic asteroid collision, a European spacecraft swung by Mars and captured rare images of the red planet's mysterious small moon Deimos, the European Space Agency said Thursday.
Europe's HERA mission is aiming to find out how much of an impact a NASA spacecraft made when it deliberately smashed into an asteroid in 2022 in the first test of our planetary defenses.
But HERA will not reach the asteroid - which is 11 million kilometers from Earth in the asteroid belt between Mars and Jupiter - until late 2026.
On the long voyage there, the spacecraft swung around Mars on Wednesday.
The spacecraft used the planet's gravity to get a "kick" that also changed its direction and saved fuel, mission analyst Pablo Munoz told a press conference.
For an hour, HERA flew as close as 5,600 kilometers from the Martian surface, at a speed of 33,480 kilometers an hour.
It used the opportunity to test some of its scientific instruments, snapping around 600 pictures, including rare ones of Deimos.
The lumpy, 12.5-kilometer-wide moon is the smaller and less well-known of the two moons of Mars.
Exactly how Deimos and the bigger Phobos were formed remains a matter of debate.
Some scientists believe they were once asteroids that were captured in the gravity of Mars, while others think they could have been shot from a massive impact on the surface.
The new images add "another piece of the puzzle" to efforts to determine their origin, Marcel Popescu of the Astronomical Institute of the Romanian Academy said.
There are hopes that data from HERA's "HyperScout" and thermal infrared imagers - which observe colors beyond the limits of the human eye - will shed light on this mystery by discovering more about the moon's composition.
Those infrared imagers are why the red planet appears blue in some of the photos.
Next, HERA will turn its focus back to asteroid Dimorphos.
When NASA's DART mission smashed into Dimorphos in 2022, it shortened the 160-meter-wide asteroid's orbit around its big brother Didymos by 33 minutes.
Although Dimorphos itself posed no threat to Earth, HERA intends to discover whether this technique could be an effective way for Earth to defend itself against possibly existence-threatening asteroids in the future.
Space agencies have been working to ramp up Earth's planetary defences, monitoring for potential threats so they can be dealt with as soon as possible.
Earlier this year, a newly discovered asteroid capable of destroying a city was briefly given a more than 3% chance of hitting Earth in 2032.
However further observations sent the chances of a direct hit back down to nearly zero.
Richard Moissl, head of the ESA's planetary defense office, said that asteroid, 2024 YR, followed a pattern that will become more common.
As we get better at scanning the skies, "we will discover asteroids at a higher rate," he said.
The ESA is developing a secondary planetary defense mission to observe the 350-meter-wide asteroid Apophis, which will fly just 32,000 kilometers from Earth on April 13, 2029.
If approved by the ESA's ministerial council, the Ramses mission will launch in 2028, reaching the asteroid two months before it approaches Earth.
(Adapted from: https://www.voanews.com/a/asteroid-probe-snaps-rare-images-of-martian-moon/8009850.html )
Mark the correct option that presents a paraphrase for the following extract: "If approved by the ESA's ministerial council, the Ramses mission will launch in 2028".Resolução comentada
Análise das alternativas
TEXT II
TITLE: Asteroid probe snaps rare images of Martian Moon
March 13, 2025 3:29 PM
By Agence France-Press
Paris -
On the way to investigate the scene of a historic asteroid collision, a European spacecraft swung by Mars and captured rare images of the red planet's mysterious small moon Deimos, the European Space Agency said Thursday.
Europe's HERA mission is aiming to find out how much of an impact a NASA spacecraft made when it deliberately smashed into an asteroid in 2022 in the first test of our planetary defenses.
But HERA will not reach the asteroid - which is 11 million kilometers from Earth in the asteroid belt between Mars and Jupiter - until late 2026.
On the long voyage there, the spacecraft swung around Mars on Wednesday.
The spacecraft used the planet's gravity to get a "kick" that also changed its direction and saved fuel, mission analyst Pablo Munoz told a press conference.
For an hour, HERA flew as close as 5,600 kilometers from the Martian surface, at a speed of 33,480 kilometers an hour.
It used the opportunity to test some of its scientific instruments, snapping around 600 pictures, including rare ones of Deimos.
The lumpy, 12.5-kilometer-wide moon is the smaller and less well-known of the two moons of Mars.
Exactly how Deimos and the bigger Phobos were formed remains a matter of debate.
Some scientists believe they were once asteroids that were captured in the gravity of Mars, while others think they could have been shot from a massive impact on the surface.
The new images add "another piece of the puzzle" to efforts to determine their origin, Marcel Popescu of the Astronomical Institute of the Romanian Academy said.
There are hopes that data from HERA's "HyperScout" and thermal infrared imagers - which observe colors beyond the limits of the human eye - will shed light on this mystery by discovering more about the moon's composition.
Those infrared imagers are why the red planet appears blue in some of the photos.
Next, HERA will turn its focus back to asteroid Dimorphos.
When NASA's DART mission smashed into Dimorphos in 2022, it shortened the 160-meter-wide asteroid's orbit around its big brother Didymos by 33 minutes.
Although Dimorphos itself posed no threat to Earth, HERA intends to discover whether this technique could be an effective way for Earth to defend itself against possibly existence-threatening asteroids in the future.
Space agencies have been working to ramp up Earth's planetary defences, monitoring for potential threats so they can be dealt with as soon as possible.
Earlier this year, a newly discovered asteroid capable of destroying a city was briefly given a more than 3% chance of hitting Earth in 2032.
However further observations sent the chances of a direct hit back down to nearly zero.
Richard Moissl, head of the ESA's planetary defense office, said that asteroid, 2024 YR, followed a pattern that will become more common.
As we get better at scanning the skies, "we will discover asteroids at a higher rate," he said.
The ESA is developing a secondary planetary defense mission to observe the 350-meter-wide asteroid Apophis, which will fly just 32,000 kilometers from Earth on April 13, 2029.
If approved by the ESA's ministerial council, the Ramses mission will launch in 2028, reaching the asteroid two months before it approaches Earth.
(Adapted from: https://www.voanews.com/a/asteroid-probe-snaps-rare-images-of-martian-moon/8009850.html )
Mark the correct option that presents a paraphrase to the following extract: "The spacecraft used the planet's gravity to get a 'kick'."Resolução comentada
Análise das alternativas
TEXT II
TITLE: Asteroid probe snaps rare images of Martian Moon
March 13, 2025 3:29 PM
By Agence France-Press
Paris -
On the way to investigate the scene of a historic asteroid collision, a European spacecraft swung by Mars and captured rare images of the red planet's mysterious small moon Deimos, the European Space Agency said Thursday.
Europe's HERA mission is aiming to find out how much of an impact a NASA spacecraft made when it deliberately smashed into an asteroid in 2022 in the first test of our planetary defenses.
But HERA will not reach the asteroid - which is 11 million kilometers from Earth in the asteroid belt between Mars and Jupiter - until late 2026.
On the long voyage there, the spacecraft swung around Mars on Wednesday.
The spacecraft used the planet's gravity to get a "kick" that also changed its direction and saved fuel, mission analyst Pablo Munoz told a press conference.
For an hour, HERA flew as close as 5,600 kilometers from the Martian surface, at a speed of 33,480 kilometers an hour.
It used the opportunity to test some of its scientific instruments, snapping around 600 pictures, including rare ones of Deimos.
The lumpy, 12.5-kilometer-wide moon is the smaller and less well-known of the two moons of Mars.
Exactly how Deimos and the bigger Phobos were formed remains a matter of debate.
Some scientists believe they were once asteroids that were captured in the gravity of Mars, while others think they could have been shot from a massive impact on the surface.
The new images add "another piece of the puzzle" to efforts to determine their origin, Marcel Popescu of the Astronomical Institute of the Romanian Academy said.
There are hopes that data from HERA's "HyperScout" and thermal infrared imagers - which observe colors beyond the limits of the human eye - will shed light on this mystery by discovering more about the moon's composition.
Those infrared imagers are why the red planet appears blue in some of the photos.
Next, HERA will turn its focus back to asteroid Dimorphos.
When NASA's DART mission smashed into Dimorphos in 2022, it shortened the 160-meter-wide asteroid's orbit around its big brother Didymos by 33 minutes.
Although Dimorphos itself posed no threat to Earth, HERA intends to discover whether this technique could be an effective way for Earth to defend itself against possibly existence-threatening asteroids in the future.
Space agencies have been working to ramp up Earth's planetary defences, monitoring for potential threats so they can be dealt with as soon as possible.
Earlier this year, a newly discovered asteroid capable of destroying a city was briefly given a more than 3% chance of hitting Earth in 2032.
However further observations sent the chances of a direct hit back down to nearly zero.
Richard Moissl, head of the ESA's planetary defense office, said that asteroid, 2024 YR, followed a pattern that will become more common.
As we get better at scanning the skies, "we will discover asteroids at a higher rate," he said.
The ESA is developing a secondary planetary defense mission to observe the 350-meter-wide asteroid Apophis, which will fly just 32,000 kilometers from Earth on April 13, 2029.
If approved by the ESA's ministerial council, the Ramses mission will launch in 2028, reaching the asteroid two months before it approaches Earth.
(Adapted from: https://www.voanews.com/a/asteroid-probe-snaps-rare-images-of-martian-moon/8009850.html )
According to the text, HERA's main objective was:Resolução comentada
Análise das alternativas
Resolução comentada
Análise das alternativas
Duas canalizações transportam água sob pressão em regime de escoamento forçado. Para determinar o módulo da diferença de pressão entre dois pontos, A e B, dessas canalizações, utiliza-se um manômetro diferencial de mercúrio. Sabe-se que a diferença de nível entre os centros das seções A e B é h = 7,6 m e que a deflexão do mercúrio no manômetro é z = 0,77 m. Com base nessas informações, assinale a opção que apresenta corretamente a diferença de pressão entre os pontos A e B.
Dados:
- Peso específico da água: γ = 1000 kgf/m³
- Peso específico do Mercúrio: γ = 13600 kgf/m³Resolução comentada
Análise das alternativas
Resolução comentada
Análise das alternativas
Lança-se uma bola de beisebol de massa m a uma velocidade v₁ contra um taco. Após ter sido rebatida, a bola tem uma velocidade v₂ na direção do ângulo θ, conforme mostra a figura acima. Se o contato entre a bola e o taco dura um intervalo de tempo Δt. Assinale a opção que corresponde a uma expressão para o módulo da força impulsiva média, sabendo que todos os dados são não nulos e estão no S.I.Resolução comentada
Análise das alternativas
Considere o túnel de vento, com seção retangular constante, da figura, no qual um modelo de avião em escala reduzida está sendo usado para testes.Nas condições de projeto, o perfil da velocidade na entrada pode ser suposto constante, igual a um valor Vₘ. A altura do canal é 2h, a profundidade vale w e o comprimento vale L. Na saída, bem longe do modelo, o perfil medido é parabólico, indicado pela expressão:
V = u(y) = K[1 − (y/h)²]
onde y é a cota medida a partir da metade do canal. O fluido é considerado incompressível e o sistema se encontra em regime permanente. Sendo assim, o valor de K na expressão acima vale:
Uma força P faz com que o eixo de diâmetro D deslize através do mancal lubrificado com velocidade constante V. O lubrificante pode ser considerado um fluido Newtoniano e o perfil de velocidade entre o eixo e o mancal linear. O espaço destinado à lâmina de fluido lubrificante entre o eixo e o mancal possui dimensão h ao longo da direção radial. Determine a expressão que representa a viscosidade e assinale a opção correta.Resolução comentada
Análise das alternativas
Resolução comentada
Análise das alternativas
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Segundo Shigley (2016), qual é a forma de lubrificação obtida pela introdução de lubrificante (as vezes ar ou água) na área de suporte de carga, a uma pressão alta o suficiente para separar as superfícies com um filme relativamente espesso de lubrificante e que não requer o movimento de uma superfície em relação a outra?
Observe a figura abaixo.
Nas tubulações, existem diversas conexões que fazem papéis de acordo com uma finalidade específica. Dentre as opções abaixo, assinale a que apresenta somente conexões que realizem o fechamento da extremidade de um tubo.
Um engenheiro pretende projetar um sistema de reaproveitamento de energia dos gases de exaustão de um navio. O sistema utilizará os gases de exaustão a 477 °C como reservatório quente e a água do mar a 27 °C como reservatório frio. Qual será a eficiência máxima permitida para esse sistema?
Analise a figura abaixo.
Sobre válvulas, pode-se afirmar que:
Analise a figura abaixo.
Analise a figura abaixo.
Segundo Jabardo (2002), os sistemas de refrigeração que utilizam recirculação de líquido possuem algumas desvantagens. Assinale a opção que apresenta uma delas.
Sobre o processo de soldadem, pode-se afirmar que: