Questões de Concurso Comentadas para engenheiro júnior

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Q2284366 Física

Tendo como referência a figura precedente, que representa um recipiente fechado e isolado termicamente, julgue o item a seguir. 


No processo de expansão do gás ideal em razão do rompimento da membrana, que ocorre dentro de um recipiente rígido, fechado e isolado termicamente, a temperatura do gás diminui. 

Alternativas
Q2284365 Física

Tendo como referência a figura precedente, que representa um recipiente fechado e isolado termicamente, julgue o item a seguir. 


Quando submetido a condições de alta pressão e alta temperatura, o comportamento de um gás real tende a se aproximar ao de um gás ideal. 

Alternativas
Q2283211 Matemática
        O tráfego de veículos em dois cruzamentos é ilustrado pelo diagrama a seguir, em que as setas indicam o sentido do tráfego e x, y, z, a, b, c e d expressam as quantidades de veículos por hora que passam nos cruzamentos.


A partir dessas informações, e considerando z = y, julgue o item seguinte.


Se a = 600, b = 150, c = 300 e d = 450, então o valor de x + y + z é inferior a 1.200.

Alternativas
Q2281249 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


Graduate students are people studying for a master’s degree or doctorate.

Alternativas
Q2281248 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


The word “physicists” means “medical doctors”. 

Alternativas
Respostas
106: E
107: E
108: C
109: C
110: E