Foram encontradas 120 questões.
Considere as seguintes afirmações a respeito de uma esfera homogênea carregada em equilíbrio eletrostático:
I - As cargas elétricas se distribuem pela superfície da esfera, independentemente de seu sinal.
II - Na superfície dessa esfera o campo elétrico é nulo.
III - Na superfície dessa esfera o campo elétrico é normal à superfície e no seu interior ele é nulo.
IV - A diferença de potencial elétrico entre dois pontos quaisquer da sua superfície é nula.
A respeito dessas afirmações, pode-se dizer que:
Provas
Questão presente nas seguintes provas
Read the text to answer question.
Air Traffic Controllers
Air traffic controllers coordinate the movement of air traffic, to ensure that aircraft stay safe distances apart.
Duties
Air traffic controllers typically do the following:
- Issue landing and takeoff instructions to pilots;
- Monitor and direct the movement of aircraft on the ground and in the air, using radar, computers, or visual references;
- Control all ground traffic at airports, including baggage vehicles and airport workers;
- Manage communications by transferring control of departing flights to traffic control centers and accepting control of arriving flights;
- Provide information to pilots, such as weather updates, runway closures, and other critical information; and
- Alert airport response staff, in the event of an aircraft emergency.
Air traffic controllers' primary concern is safety, but they also must direct aircraft efficiently to minimize delays. They manage the flow of aircraft into and out of the airport airspace, guide pilots during takeoff and landing, and monitor aircraft, as they travel through the skies.
Controllers usually manage multiple aircraft at the same time and must make quick decisions to ensure the safety of the aircraft. For example, a controller might direct one aircraft on its landing approach, while providing another aircraft with weather information.
Adapted from: ttps://collegegrad.com/careers/air-traffic-controllers
The words underlined in the text express, respectively
Provas
Questão presente nas seguintes provas
Leia:
I - O Rio Doce entrou em agonia, após o desastre que poluiu suas águas com lama.
II - Suas águas, claras, estão agora escuras, de mãos irresponsáveis que a sujaram.
Nas frases há, respectivamente, as seguintes figuras de linguagem:
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Questão presente nas seguintes provas
Dois vetores !$ V_1 !$ e !$ V_2 !$ formam entre si um ângulo !$ θ !$ e possuem módulos iguais a 5 unidades e 12 unidades, respectivamente. Se a resultante entre eles tem módulo igual a 13 unidades, podemos afirmar corretamente que o ângulo !$ θ !$ entre os vetores !$ V_1 !$ e !$ V_2 !$ vale:
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Questão presente nas seguintes provas
Considerando as velocidades de propagação da luz em dois meios homogêneos e distintos, respectivamente iguais a 200.000km/s e 120.000km/s, determine o índice de refração relativo do primeiro meio em relação ao segundo. Considere a velocidade da luz no vácuo, igual a 300.000km/s.
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Questão presente nas seguintes provas
Considere que o número de células de um embrião, contadas diariamente desde o dia da fecundação do óvulo até o 30° dia de gestação, forma a sequência: 1, 2, 4, 8, 16... A função que mostra o número de células, conforme o número de dias x, é !$ f: \{ x \in \mathrm{I\!N}; 1 \le x \le 30 \}\rightarrow \mathrm{I\!N}; f(x)= !$
Provas
Questão presente nas seguintes provas
Read the text and answer question.
It was a beautiful summer afternoon with the sun shining brightly. I excitedly phoned my friends asking them to come over later for a barbecue.
After making the calls I quickly drove into town to buy some food and drink. when I arrived at the shops I was very surprised at how busy it was. Everyone must have been shopping for a barbecue!
The first butchers I visited had completely run out of sausages. The next shop had some left so I happily bought some. After visiting a few more shops I had finally finished my shopping. But I was starting to worry as it was 6 p.m. and I had invited my friends to visit at 6:30 p.m.
I hastly rushed to the car park with all of my shopping and threw it in the boot. Suddenly I notice that the cars were moving really slowly out of the car park and there was a bit of traffic jam. It was past 6:30 p.m. when I arrived home and I was extremely worried. As a drove into my drive I smiled happily when I saw my friends sitting in my front garden. Luckily they had realized I was stuck at the shops and they waited for me.
Fonte: www.bbc.co.uk/skillswise
The four words in bold, in the text, are:
Provas
Questão presente nas seguintes provas
Seja a equação polinomial !$ x^3+bx^2+cx+18=0 !$ . Se !$ -2 !$ e !$ 3 !$ são suas raízes, sendo que a raiz 3 tem multiplicidade 2, o valor de “b” é
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Questão presente nas seguintes provas
O segmento !$ \overline{AT} !$ é tangente, em T, à circunferência de centro !$ O !$ e raio !$ R = 8 !$ cm. A potência de A em relação à circunferência é igual a ______ !$ cm^2 !$.
Provas
Questão presente nas seguintes provas
Read the text and answer question.
The Last Dalai Lama?
On a wet Sunday in June at the Glastonbury Festival, more than 100,000 people spontaneously burst into a rendition of ‘‘Happy Birthday.’’ Onstage, Tenzin Gyatso, the 14th Dalai Lama, blew out the solitary candle on a large birthday cake while clasping the hand of Patti Smith, who stood beside him. The world’s most famous monk then poked a thick finger at Smith’s silvery mane. ‘‘Musicians,’’ he said, ‘‘white hair.’’ But ‘‘the voice and physical action,’’ he added in his booming baritone, ‘‘forceful.’’ As Smith giggled, he went on: ‘‘So, that gives me encouragement. Myself, now 80 years old, but I should be like you — more active!’’
Taken from www.nytimes.com. Acessed on 14/12/15.
Match the definitions to the words:
1. clasp
2. poke
3. giggle
4. booming
( ) a loud and deep sound.
( ) to laugh in a childlike way.
( ) to hold someone’s hand firmly.
( ) to push someone or something with the fingers.
Choose the correct order:
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Questão presente nas seguintes provas
Cadernos
Caderno Container