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Na Idade Média, os exércitos utilizavam catapultas chamadas “trabucos”. Esses dispositivos eram capazes de lançar projéteis de 2 toneladas e com uma energia cinética inicial igual a 4000 J. A intensidade da velocidade inicial de lançamento, em m/s, vale
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Ao calcular !$ \large A^3 _{10} \over C^3 _{10} !$, obtém-se
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What makes a good school?
What makes a good school? There are no stock answers, but there are some universal truths. A good school is a community of parents, teachers and students. A good school, like a good class, is run by someone with vision, passion and compassion. A good school has teachers , no matter what their age or experience. A good school prepares its students not just for college entrance tests but also for the world out there.
Choose the correct sentence to have the blank filled.
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O inverso do número complexo z = –2i é z’ =
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A aresta lateral de uma pirâmide triangular regular mede 5 m, e a aresta da base, 6 m. A área lateral dessa pirâmide, em m!$ ^2 !$ , é

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Uma carga puntiforme com 4.10!$ ^{-9} !$ C, situada no vácuo, gera campo elétrico ao seu redor. Entre dois pontos, A e B, distantes respectivamente 0,6 m e 0,8 m da carga, obtem-se a diferença de potencial Vab de volts. Obs.: k0 = 9.109 Nm2 /C2
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Native and Non-Native Speakers in the radiotelephony communication
The ICAO language proficiency requirements apply to native and non-native speakers alike. As English is the most commonly used language international aviation communications, many non-native speakers of English will require language training to improve their language proficiency. Nonetheless, the burden for improved communications should not be seen as falling solely non-native speakers. Native speakers of English, too, have a fundamentally important role to play in the international efforts to increase communication safety. Improving radiotelephony safety is no small matter, requiring concerted effort and widespread cooperation, and all pilots and controllers will benefit an improved understanding of how language functions, with a focus on strategies that aid comprehension and clarity. Additionally, an ethical obligation arises on the part of native speakers of English, in particular, to increase their linguistic awareness and to take special care in the delivery of messages.
Miscommunication can, and does, occur not only between non-native speakers but also between native speakers of the same language. Miscommunication between native speakers can occur as a result of a linguistic error or feature (ambiguity, homophony, etc.) or as a result of human carelessness (poor enunciation, too much data in a single transmission, or impatience ). Miscommunication can also occur between non-native speakers or between a native speaker and non-native speaker as a result of these issues, in addition to other sources of error specific to non-native English-use.
GLOSSARY:
ICAO =International Civil Aviation Organization
burden = carga ou fardo
concerted = planejados ou combinados
In “Improving radiotelephony safety is no small matter”, we can infer that the aeronautical community has to
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A long time ago, people a way to create a nice smell. They put nice-smelling wood or leaves into a fire. A nice smell through the smoke. That is how we got the word perfume. In Latin “per” means “through”, and “fumus” means “smoke”. Scientists are finding that some smells make people feel better. They help us to relax, to sleep, or to feel happier. Scientists found that the smell of apples with spices can make our blood pressure go down. In the future, we may use perfume in a completely different way.
“They”, in bold in the text, is related to
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According to the charge, Fred interpreted the word “Compact” as
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As figuras abaixo representam ondas sonoras emitidas por 3 dispositivos diferentes.

A qualidade do som que permite ao ouvinte identificar a diferença entre os sons gerados pelos dispositivos é
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