Foram encontradas 50 questões.
O atrito constante entre um pano e um bastão provoca um acúmulo de cargas elétricas na superfície deste bastão. Ao aproximá-lo de pequenos corpos, como pedaços de papel, estes podem ser atraídos. Assim, assinale a opção que apresenta a denominação desse fenômeno.
Provas
Suponha que a velocidade do som no ar seja de 340m/s e que o espectro sonoro audível está na faixa de 20Hz a 20kHz. Com base nessas informações, determine a diferença em metros entre os comprimentos de onda da frequência mais baixa pela frequência mais alta do espectro audível e assinale a opção correta.
Provas
Analise o gráfico abaixo.
Com base no gráfico da posição de um veículo no tempo, apresentado acima, no qual cada marcação indica uma mudança no regime de velocidade. Identifique qual é a representação gráfica qualitativa da velocidade no tempo desse mesmo veículo e assinale a resposta correta.
Provas
Examine o circuito elétrico abaixo.
Com base no circuito apresentado acima, assinale a opção que completa corretamente as lacunas da sentença abaixo.
I - Se a chave S1 estiver fechada e S2 estiver aberta, os resistores R1 e R2 estarão ______.
II - Se a chave S1 estiver aberta e S2 estiver fechada, os resistores R1 e R2 estarão em ______.
III - Se as chaves S1 e S2 estiverem fechadas, ______ corrente pelo resistor R2.
IV - Se somente a chave S2 estiver fechada e V = 15V, R1 = 2\( \Omega \) e R2 = 1\( \Omega \), a potência elétrica consumida por este circuito é de ____.
Provas
Três lanchas competem em uma corrida na Baía de Guanabara. Na última etapa da corrida, a lancha li lidera faltando 360m para a chegada, enquanto a lancha I está a 720m e a lancha Ili está a 540m da chegada. A lancha I navega a 25 nós, a lancha II a 10 nós e lancha III a 15 nós, todas com velocidade constante. Assim, determine qual das três lanchas chegará em primeiro lugar e assinale a resposta correta. Dado: 1 nó = 1,8m/s
Provas
Dez instrutores de um curso de qualificação, entre eles Outra, Ramos, Roner e Wagner, formarão uma equipe de vôlei, com seis jogadores e posições irrelevantes. Com base nessas informações, assinale a opção que apresenta corretamente a probabilidade de essa equipe ter exatamente dois instrutores dos quatro supracitados.
Provas
Which option contains the sentence that best completes the blank space below?
l'm very hungry! _______.
Provas
Screen Time Is Stolen Time
A French neuroscientist shows lha! screens and kids shouldn't mix.
ln lhe good old days, lhe triad of family, school, and street maintained lhe raising of children and adolescents. The Internet first replaced lhe street. Then, it conquered schools. Now, it's swallowing families. The triad of raising youngsters has become screen, screen, screen.
ln 2019, French neuroscientist Michel Desmurget published lhe book La Fabrique du Crétin Digital (The Digital Cretin Factory), which has now been translated into English with lhe more moderate title of Screen Damage. ln lhe book Desmurget presents some vitally important points.
Our children are immersed in screens much more than we think. ln their first two years, Desmurget shows, kids spend, on average, nearly 50 minutes daily on screens. Screen time reaches two hours and 45 minutes between lhe ages of two and eight, four hours and 45 minutes between lhe ages of eight and 12, and an astonishing seven hours and 15 minutes between lhe ages of 13 and 18. That represents 20 percent, 32 percent, and 45 percent of kids' waking time, respectively.
According to Desmurget, technologies rapidly grow to satisfy lhe needs of lhe myth of "digital natives," and "digital natives" grow even more digital as they are more immersed ·in screens. Simultaneously, as Desmurget shows, lhe. more that countries invest in "information and communication technologies for education," lhe more pupil performance falis. The consequences are no! jus! academic failure but arrested cognitive, physical, emotional, and social development.
Studies show lha! "children who learn to write on a computer, with a keyboard, have a much harder time remembering and recognizing letters than those who learn with their hand, a penei! and a sheet of paper." The positive effect of screens, even when employed for educational purposes, is either negligible or nondetectable; lhe damage is huge. Even more devastating is lhe harm of recreational digital use.
The time spent with screens in early age is simply "stolen time" from kids' development. Adults usually tolerate lhe waste of their time on gadgets, as they think they can compensate for this loss through !ater efforts. li does no! work this way for children. Early cognitive development heavily relies on lhe plasticity of lhe young brain. "The great periods of brain plasticity ... do no! las! forever," writes Desmurget. "Once closed, they can no longer be resuscitated. What has been spoiled is forever los!."
For example, basic language skills form in lhe first years of life. Live interaction with adults makes children's language incomparably richer than any screen substitutes, even educational ones. The reason is simple: adults use a great variety of words and syntactic structures, while educational TV programs tend to employ "ageappropriate," meaning artificially reduced vocabulary and syntax. Adults also routinely correct kids, and this provides much wider speech diversity than any well-designed program could ever do.
A lack of real human communication in lhe first four years of life irreparably affects development. lf screens occupy 20 percent to 30 percent of kids' waking time ai this age, they subtract a respective share of cognitive development, giving back nothing in exchange except for health issues, aggressiveness, and anxiety.
(Adapted from: https://www.city-journal.org)
Decide if lhe statements below are true (T) or false (F), according to lhe text. Then choose lhe option that contains lhe correct sequence.
( ) The amount of time lha! children spend using screens is higher than lhe amount of time spent by adolescents.
( ) The use of "information and communication technologies for education" has led to students' lower performance, and problems in their cognitive, emotional, and social development.
( ) Writing by hand on paper is more effective for children who am learning to write than writing on a computer, with a keyboard.
( ) The damage caused to learners by lhe use of screens is enormous.
( ) The author says lha! adults are responsible for kids' "stolen time" from their development.
( ) The author says lha! both children and adults can compensate for lhe lesses in their cognitive development.
Provas
Complete lhe dialogue with lhe correct sentence.
Keith: What time is lhe exam tomorrow, Susan?
Susan: At 9:00. _____.
Provas
Read the text below and choose the option with the verbs that best complete the blanks in the correct arder.
My family is very aclive. 1 lave water sports. I ___ in the lake on the weekends. My sisters -~- two miles to school and my older brother____ basketball alter classes. My parents __ yoga when they get home from work and finally my little brother __ a bike in the park every day.
Provas
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