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Q869870 Engenharia Mecânica

Trincas são defeitos considerados graves na soldagem, pois são fortes concentradores de tensão.


Com relação às características da formação da decoesão lamelar, deve-se considerar que a decoesão lamelar

Alternativas
Q869869 Engenharia Mecânica

Uma característica importante do ciclo térmico de um ponto da junta soldada é a velocidade de resfriamento.


Com relação às variáveis que influenciam a taxa de resfriamento, tem-se que

Alternativas
Q869868 Engenharia Mecânica
Com relação ao tipo de corrente de soldagem em processos por arco elétrico, utilizados na soldagem de uma junta, é importante considerar que na comparação entre alternada e contínua, para uma mesma intensidade de corrente, a corrente tipo
Alternativas
Q869867 Engenharia Mecânica

Imagem associada para resolução da questão


A viga de três apoios, mostrada na figura acima, é estaticamente indeterminada porque a quantidade de reações de apoio incógnitas e a quantidade de equações estabelecidas pelas condições estáticas são, respectivamente,

Alternativas
Q869866 Engenharia Mecânica

Um reservatório de água (ρ = 1000 kg/m3 ) possui duas saídas nas alturas de 2 m e 4 m em relação à base.

Se o nível da água no interior do reservatório é de 10 m em relação à base, considerando-se g = 10 m/s2 , a diferença entre as pressões hidrostáticas nas duas saídas, em kPa, é de

Alternativas
Q869865 Engenharia Mecânica

Imagem associada para resolução da questão


A figura mostra uma viga engastada-livre de seção transversal retangular, sujeita a uma força F atuante na extremidade livre.


Os pontos da viga onde atuam a maior tensão normal de tração e a maior tensão cisalhante são, respectivamente, os pontos

Alternativas
Q869864 Engenharia Mecânica
Um óleo com módulo de compressibilidade de 2,0 GN/m2 é utilizado no circuito hidráulico de acionamento de um atuador linear onde o volume da câmara de avanço é de 0,01 m3 .
Ao ser submetido a uma pressão de 10 MPa, a variação no volume desse óleo, em m3 , será de
Alternativas
Q869863 Engenharia Mecânica

Imagem associada para resolução da questão


O escoamento de um fluido incompressível passa de uma tubulação de diâmetro D para outra de diâmetro D/2 através de um bocal, conforme mostrado na figura acima.


Se a vazão na saída é de 0,01 m3 /s, para uma área de saída de 200 cm2 , a velocidade na entrada, em m/s, é de

Alternativas
Q869862 Engenharia Mecânica
O número de Reynolds é a razão entre as forças
Alternativas
Q869861 Engenharia Mecânica

Um ensaio uniaxial por tração e por compressão é realizado em uma barra com área de seção transversal de 2,0 cm2 e comprimento de 20 cm. As forças aplicadas e as correspondentes deformações obtidas no ensaio são mostradas na figura abaixo.


                                 

Com base na região de tração, o módulo de elasticidade do material da barra, em GPa, vale
Alternativas
Q869860 Engenharia Mecânica

Um ensaio uniaxial por tração e por compressão é realizado em uma barra com área de seção transversal de 2,0 cm2 e comprimento de 20 cm. As forças aplicadas e as correspondentes deformações obtidas no ensaio são mostradas na figura abaixo.


                                 

Com base nos resultados apresentados na figura e considerando-se os pontos P e Q como limites de resistência, conclui-se que o material
Alternativas
Q869859 Engenharia Mecânica
A eficiência térmica teórica máxima para qualquer ciclo de potência operando entre reservatórios a 427° C e 97° C, em %, é
Alternativas
Q869858 Engenharia Mecânica

Um ciclo de refrigeração que opera conforme a figura abaixo possui um coeficiente de desempenho de 2, e o valor de Qsai é 480 kJ.


                           

Qual o valor, em kJ, de Wciclo?
Alternativas
Q869857 Engenharia Mecânica

Um ciclo de refrigeração que opera conforme a figura abaixo possui um coeficiente de desempenho de 2, e o valor de Qsai é 480 kJ.


                           

Qual o valor, em kJ, de Qentra?
Alternativas
Q869856 Engenharia Mecânica
Para sistemas de substâncias puras compressíveis simples, o princípio dos estados equivalentes indica que o número de propriedades
Alternativas
Q262863 Português
                                                                Science fiction
O marciano encontrou-me na rua e teve medo de minha impossibilidade humana. Como pode existir, pensou consigo, um ser que no existir põe tamanha anulação de existência?
Afastou-se o marciano, e persegui-o. Precisava dele como de um testemunho. Mas, recusando o colóquio, desintegrou-se no ar constelado de problemas.
E fiquei só em mim, de mim ausente.
ANDRADE, Carlos Drummond de. Science fiction. Poesia e prosa. Rio de Janeiro: Nova Aguilar, 1988, p. 330-331. 
A palavra a, na língua portuguesa, pode ser grafada de três formas distintas entre si, sem que a pronúncia se altere: a, à, há. No entanto, significado e classe gramatical dessas palavras variam.

A frase abaixo deverá sofrer algumas alterações nas palavras em destaque para adequar-se à norma-padrão.

A muito tempo não vejo a parte da minha família a qual foi deixada de herança a fazenda a que todos devotavam grande afeto.

De acordo com a norma-padrão, a correção implicaria, respectivamente, esta sequência de palavras:
Alternativas
Q252461 Inglês
                                   Safety Meeting Presentation

  Today's meeting is really about you. I can stand in front of you and talk about working safely and what procedures to follow until I'm blue in the face. But until you understand the need for working safely, until you are willing to be responsible for your safety, it doesn't mean a whole lot.
   Some of you may be familiar with OSHA - the Occupational Safety & Health Administration. The sole purpose of this agency is to keep American workers safe. Complying with OSHA regulations isn't always easy, but if we work together, we can do it. Yet, complying with regulations is not the real reason for working safely. Our real motive is simple. We care about each and every one of you and will do what is necessary to prevent you from being injured.
   However, keeping our workplace safe takes input from everyone. Management, supervisor, and all of you have to come together on this issue, or we're in trouble. For example, upper management has to approve the purchase of safe equipment. Supervisors, including myself, have to ensure that each of you knows how to use that equipment safely. Then it's up to you to follow through the task and use the equipment as you were trained. If any one part of this chain fails, accidents are going to happen and people are going to get hurt.

Responsibility Number One - Recognize Hazards
   At the core of your safety responsibilities lies the task of recognizing safety and health hazards. In order to do that, you must first understand what constitutes a hazard. Extreme hazards are often obvious. Our hopes are that you won't find too many of those around here.
   There are, however, more subtle hazards that won't jump up and bite you. As a result of your safety training and meetings like these, some things may come to mind. For example, a machine may not be easy to lock out. Common practice may be to use a tag. This is a potential hazard and should be discussed. Maybe something can be changed to make it easier to use a lock. Other subtle hazards include such things as frayed electrical cords, a loose machine guard, a cluttered aisle, or maybe something that just doesn't look right.

Responsibility Number Two - Report Hazards
    A big part of recognizing hazards is using your instincts. Nobody knows your job as well as you do, so we're counting on you to let us know about possible problems. Beyond recognizing hazards, you have to correct them or report them to someone who can. This too, is a judgement call. For example, if something spills in your work area you can probably clean it up yourself. However, if there is an unlabeled chemical container and you have no idea what it is, you should report it to your supervisor.

Additional Employee Responsibilities
   Good housekeeping is a major part of keeping your work area safe. For example, you should take a few minutes each day to ensure that aisles, hallways, and stairways in your work area are not obstructed. If boxes, equipment, or anything else is left to pile up, you have a tripping hazard on your hands. Those obstructions could keep you from exiting the building quickly and safely should you face an emergency situation.
   Also watch out for spills. These can lead to slips and falls. Flammable materials are another thing to be aware of. Make sure they are disposed of properly.
   Keep Thinking. Even if you're doing your job safely and you are avoiding hazards, there are often even better ways to work safely. If you have ideas for improving the safety of your job or that of co-workers, share them.

   Concluding Remarks
  While nothing we do can completely eliminate the threat of an incident, we can work together to improve our odds. As I said, this must be a real team effort and I'm counting on input from all of you. Let's keep communicating and continue to improve safety.

  Available at: <http://www.ncsu.edu/ehs/www99/right/training/meeting/emplores.html>.Retrieved on: April 1st, 2012. Adapted.

According to the text, it is clear that the author
Alternativas
Q252460 Inglês
                                   Safety Meeting Presentation

  Today's meeting is really about you. I can stand in front of you and talk about working safely and what procedures to follow until I'm blue in the face. But until you understand the need for working safely, until you are willing to be responsible for your safety, it doesn't mean a whole lot.
   Some of you may be familiar with OSHA - the Occupational Safety & Health Administration. The sole purpose of this agency is to keep American workers safe. Complying with OSHA regulations isn't always easy, but if we work together, we can do it. Yet, complying with regulations is not the real reason for working safely. Our real motive is simple. We care about each and every one of you and will do what is necessary to prevent you from being injured.
   However, keeping our workplace safe takes input from everyone. Management, supervisor, and all of you have to come together on this issue, or we're in trouble. For example, upper management has to approve the purchase of safe equipment. Supervisors, including myself, have to ensure that each of you knows how to use that equipment safely. Then it's up to you to follow through the task and use the equipment as you were trained. If any one part of this chain fails, accidents are going to happen and people are going to get hurt.

Responsibility Number One - Recognize Hazards
   At the core of your safety responsibilities lies the task of recognizing safety and health hazards. In order to do that, you must first understand what constitutes a hazard. Extreme hazards are often obvious. Our hopes are that you won't find too many of those around here.
   There are, however, more subtle hazards that won't jump up and bite you. As a result of your safety training and meetings like these, some things may come to mind. For example, a machine may not be easy to lock out. Common practice may be to use a tag. This is a potential hazard and should be discussed. Maybe something can be changed to make it easier to use a lock. Other subtle hazards include such things as frayed electrical cords, a loose machine guard, a cluttered aisle, or maybe something that just doesn't look right.

Responsibility Number Two - Report Hazards
    A big part of recognizing hazards is using your instincts. Nobody knows your job as well as you do, so we're counting on you to let us know about possible problems. Beyond recognizing hazards, you have to correct them or report them to someone who can. This too, is a judgement call. For example, if something spills in your work area you can probably clean it up yourself. However, if there is an unlabeled chemical container and you have no idea what it is, you should report it to your supervisor.

Additional Employee Responsibilities
   Good housekeeping is a major part of keeping your work area safe. For example, you should take a few minutes each day to ensure that aisles, hallways, and stairways in your work area are not obstructed. If boxes, equipment, or anything else is left to pile up, you have a tripping hazard on your hands. Those obstructions could keep you from exiting the building quickly and safely should you face an emergency situation.
   Also watch out for spills. These can lead to slips and falls. Flammable materials are another thing to be aware of. Make sure they are disposed of properly.
   Keep Thinking. Even if you're doing your job safely and you are avoiding hazards, there are often even better ways to work safely. If you have ideas for improving the safety of your job or that of co-workers, share them.

   Concluding Remarks
  While nothing we do can completely eliminate the threat of an incident, we can work together to improve our odds. As I said, this must be a real team effort and I'm counting on input from all of you. Let's keep communicating and continue to improve safety.

  Available at: <http://www.ncsu.edu/ehs/www99/right/training/meeting/emplores.html>.Retrieved on: April 1st, 2012. Adapted.

The expression in boldface introduces the idea of consequence in the fragment:
Alternativas
Q252459 Inglês
                                   Safety Meeting Presentation

  Today's meeting is really about you. I can stand in front of you and talk about working safely and what procedures to follow until I'm blue in the face. But until you understand the need for working safely, until you are willing to be responsible for your safety, it doesn't mean a whole lot.
   Some of you may be familiar with OSHA - the Occupational Safety & Health Administration. The sole purpose of this agency is to keep American workers safe. Complying with OSHA regulations isn't always easy, but if we work together, we can do it. Yet, complying with regulations is not the real reason for working safely. Our real motive is simple. We care about each and every one of you and will do what is necessary to prevent you from being injured.
   However, keeping our workplace safe takes input from everyone. Management, supervisor, and all of you have to come together on this issue, or we're in trouble. For example, upper management has to approve the purchase of safe equipment. Supervisors, including myself, have to ensure that each of you knows how to use that equipment safely. Then it's up to you to follow through the task and use the equipment as you were trained. If any one part of this chain fails, accidents are going to happen and people are going to get hurt.

Responsibility Number One - Recognize Hazards
   At the core of your safety responsibilities lies the task of recognizing safety and health hazards. In order to do that, you must first understand what constitutes a hazard. Extreme hazards are often obvious. Our hopes are that you won't find too many of those around here.
   There are, however, more subtle hazards that won't jump up and bite you. As a result of your safety training and meetings like these, some things may come to mind. For example, a machine may not be easy to lock out. Common practice may be to use a tag. This is a potential hazard and should be discussed. Maybe something can be changed to make it easier to use a lock. Other subtle hazards include such things as frayed electrical cords, a loose machine guard, a cluttered aisle, or maybe something that just doesn't look right.

Responsibility Number Two - Report Hazards
    A big part of recognizing hazards is using your instincts. Nobody knows your job as well as you do, so we're counting on you to let us know about possible problems. Beyond recognizing hazards, you have to correct them or report them to someone who can. This too, is a judgement call. For example, if something spills in your work area you can probably clean it up yourself. However, if there is an unlabeled chemical container and you have no idea what it is, you should report it to your supervisor.

Additional Employee Responsibilities
   Good housekeeping is a major part of keeping your work area safe. For example, you should take a few minutes each day to ensure that aisles, hallways, and stairways in your work area are not obstructed. If boxes, equipment, or anything else is left to pile up, you have a tripping hazard on your hands. Those obstructions could keep you from exiting the building quickly and safely should you face an emergency situation.
   Also watch out for spills. These can lead to slips and falls. Flammable materials are another thing to be aware of. Make sure they are disposed of properly.
   Keep Thinking. Even if you're doing your job safely and you are avoiding hazards, there are often even better ways to work safely. If you have ideas for improving the safety of your job or that of co-workers, share them.

   Concluding Remarks
  While nothing we do can completely eliminate the threat of an incident, we can work together to improve our odds. As I said, this must be a real team effort and I'm counting on input from all of you. Let's keep communicating and continue to improve safety.

  Available at: <http://www.ncsu.edu/ehs/www99/right/training/meeting/emplores.html>.Retrieved on: April 1st, 2012. Adapted.

Based on the meanings in the text, it is clear that
Alternativas
Q252458 Inglês
                                   Safety Meeting Presentation

  Today's meeting is really about you. I can stand in front of you and talk about working safely and what procedures to follow until I'm blue in the face. But until you understand the need for working safely, until you are willing to be responsible for your safety, it doesn't mean a whole lot.
   Some of you may be familiar with OSHA - the Occupational Safety & Health Administration. The sole purpose of this agency is to keep American workers safe. Complying with OSHA regulations isn't always easy, but if we work together, we can do it. Yet, complying with regulations is not the real reason for working safely. Our real motive is simple. We care about each and every one of you and will do what is necessary to prevent you from being injured.
   However, keeping our workplace safe takes input from everyone. Management, supervisor, and all of you have to come together on this issue, or we're in trouble. For example, upper management has to approve the purchase of safe equipment. Supervisors, including myself, have to ensure that each of you knows how to use that equipment safely. Then it's up to you to follow through the task and use the equipment as you were trained. If any one part of this chain fails, accidents are going to happen and people are going to get hurt.

Responsibility Number One - Recognize Hazards
   At the core of your safety responsibilities lies the task of recognizing safety and health hazards. In order to do that, you must first understand what constitutes a hazard. Extreme hazards are often obvious. Our hopes are that you won't find too many of those around here.
   There are, however, more subtle hazards that won't jump up and bite you. As a result of your safety training and meetings like these, some things may come to mind. For example, a machine may not be easy to lock out. Common practice may be to use a tag. This is a potential hazard and should be discussed. Maybe something can be changed to make it easier to use a lock. Other subtle hazards include such things as frayed electrical cords, a loose machine guard, a cluttered aisle, or maybe something that just doesn't look right.

Responsibility Number Two - Report Hazards
    A big part of recognizing hazards is using your instincts. Nobody knows your job as well as you do, so we're counting on you to let us know about possible problems. Beyond recognizing hazards, you have to correct them or report them to someone who can. This too, is a judgement call. For example, if something spills in your work area you can probably clean it up yourself. However, if there is an unlabeled chemical container and you have no idea what it is, you should report it to your supervisor.

Additional Employee Responsibilities
   Good housekeeping is a major part of keeping your work area safe. For example, you should take a few minutes each day to ensure that aisles, hallways, and stairways in your work area are not obstructed. If boxes, equipment, or anything else is left to pile up, you have a tripping hazard on your hands. Those obstructions could keep you from exiting the building quickly and safely should you face an emergency situation.
   Also watch out for spills. These can lead to slips and falls. Flammable materials are another thing to be aware of. Make sure they are disposed of properly.
   Keep Thinking. Even if you're doing your job safely and you are avoiding hazards, there are often even better ways to work safely. If you have ideas for improving the safety of your job or that of co-workers, share them.

   Concluding Remarks
  While nothing we do can completely eliminate the threat of an incident, we can work together to improve our odds. As I said, this must be a real team effort and I'm counting on input from all of you. Let's keep communicating and continue to improve safety.

  Available at: <http://www.ncsu.edu/ehs/www99/right/training/meeting/emplores.html>.Retrieved on: April 1st, 2012. Adapted.

The modal auxiliary in boldface conveys the idea of obligation in the fragment:
Alternativas
Respostas
301: C
302: B
303: D
304: D
305: B
306: E
307: C
308: B
309: A
310: A
311: C
312: C
313: A
314: C
315: B
316: C
317: B
318: C
319: A
320: D