Questões - IME | Gabarito e resoluções

[IME- 2010/2011 - 1a fase] Um observador e uma fonte sonora de frequncia constante movem-se, respectivamente, segundo as equaes temporais projetadas nos eixos X e Y: Observao: A velocidade de propagao da onda muito maior que as velocidades do observador e da fonte. Com relao ao instante t (0 t ), o observador perceber uma frequncia:

(IME - 2010/2011 - 1 FASE) MARQUE A ALTERNATIVA QUE COMPLETA CORRETAMENTE A FRASE. ATT said presale _____ were 10 times higher than they were for the previous version of the iPhone.

[IME- 2010/2011 - 1a fase] O valor da resistncia equivalente entre os terminais A e B do circuito, mostrado na figura acima, :

(IME - 2010/2011 - 1 FASE) MARQUE A ALTERNATIVA QUE COMPLETA CORRETAMENTE A FRASE. Advocates of hydrogen-fuel-cell propulsion have a new _____ for their technology: trolleys. Engineers and transit planners concluded that streetcars are an ideal early application for hydrogen propulsion.

[IME- 2010/2011 - 1a fase] Uma lente convergente de distncia focal f situa-se entre o objeto A e a tela T, como mostra a figura acima. Sendo L a distncia entre o objeto e a tela, considere as seguintes afirmativas: I. Se L 4f, existem duas posies da lente separadas por uma distncia , para as quais formada na tela uma imagem real. II. Se L 4f, existe apenas uma posio da lente para a qual formada na tela uma imagem real. III. Se L = 4f, existe apenas uma posio da lente para a qual formada na tela uma imagem real.

(IME - 2010/2011 - 1 FASE) MARQUE A ALTERNATIVA QUE COMPLETA CORRETAMENTE A FRASE. The British communications _____ has released a road map calling for the completion of the nations move from analog FM to the digital audio broadcast (DAB) standard by the end of 2015.

(IME - 2010/2011 - 1 FASE) Is Facebook, the social networking website, making us narcissist? A new book argues were much more self-absorbed nowadays, stating that technology is to blame. I tweet, therefore I am. Or is it, I tweet, therefore I am insufferable? As if adult celebrities that pop out on the red carpets werent clue enough, we now have statistical evidence that we are a lot more in love with ourselves than we used to be. This social phenomenon has raised fields of research to academic studies nowadays. In the book The Narcissism Epidemic: Living in the Age of Entitlement, Jean M. Twenge, a professor of psychology at San Diego State University, and W. Keith Campbell, a social psychologist at the University of Georgia, look to the Narcissistic Personality Inventory, which measures self-regard, materialism, and lack of empathy. They found that the number of college students scoring high on the test has risen by 30 percent since the early 1980s. What kind of human behavior is central to the study mentioned in the text?

[IME- 2010/2011 - 1a fase] A figura acima apresenta um perfil metlico AB, com dimenses AC = 0,20 m e CB = 0,18 m, apoiado em C por meio de um pino sem atrito. Admitindo-se desprezvel o peso do perfil AB, o valor da fora vertical F, em newtons, para que o sistema fique em equilbrio na situao da figura : Dados: sen(15) = 0,26 cos(15) = 0,97

(IME - 2010/2011 - 1 FASE) Is Facebook, the social networking website, making us narcissist? A new book argues were much more self-absorbed nowadays, stating that technology is to blame. I tweet, therefore I am. Or is it, I tweet, therefore I am insufferable? As if adult celebrities that pop out on the red carpets werent clue enough, we now have statistical evidence that we are a lot more in love with ourselves than we used to be. This social phenomenon has raised fields of research to academic studies nowadays. In the book The Narcissism Epidemic: Living in the Age of Entitlement, Jean M. Twenge, a professor of psychology at San Diego State University, and W. Keith Campbell, a social psychologist at the University of Georgia, look to the Narcissistic Personality Inventory, which measures self-regard, materialism, and lack of empathy. They found that the number of college students scoring high on the test has risen by 30 percent since the early 1980s. What has NOT been encouraging people to act the way described in the text?

[IME- 2010/2011 - 1a fase] A figura acima apresenta um pequeno corpo de massa m em queda livre na direo do centro de um planeta de massa M e de raio r sem atmosfera, cujas superfcies distam D. correto afirmar que a acelerao do corpo Observaes: D r; M m;

(IME - 2010/2011 - 1 FASE) Scientists say juggling e-mail, phone calls and other incoming information can change how people think and behave. They say our ability to focus is being undermined by bursts of information. These play to a primitive impulse to respond to immediate opportunities and threats. The stimulation provokes excitement a dopamine squirt that researchers say can be addictive. In its absence, people feel bored. The resulting distractions can have deadly consequences, as when cell phone-wielding drivers and train engineers cause wrecks. And for millions of people these urges can inflict nicks and cuts on creativity and deep thought, interrupting work and family life. What does the passage imply?

[IME- 2010/2011 - 1a fase] A figura acima apresenta um circuito composto por dois solenoides com resistncias desprezveis e dois resistores de 2 Ω ligados a uma bateria. Uma corrente induzida em uma espira situada entre os dois solenoides quando esta se desloca da direita para a esquerda, a partir da posio equidistante em relao aos solenoides. Sabendo-se que as influncias mtuas dos campos magnticos no interior de cada solenoide so desprezveis, pode-se afirmar que o valor da tenso da bateria em volts e o sentido da corrente induzida na espira para o observador so: Dados: Campo magntico no interior de cada solenoide: Permeabilidade magntica no vcuo: Nmero de espiras de cada solenoide: 10 Comprimento de cada solenoide: 4 cm

[IME- 2010/2011 - 1a fase] Considere um meio estratificado em N camadas com ndices de refrao , como mostrado na figura acima, onde esto destacados os raios traados por uma onda luminosa que os atravessa, assim como seus respectivos ngulos com as normais a cada interface. Se para , ento N igual a: Observaes: A escala da figura no est associada aos dados. Admite-se que sempre ocorrer a refrao.

[IME- 2010/2011 - 1a fase] A figura acima apresenta uma fonte sonora pontual que emite uma onda harmnica esfrica em um meio no dispersivo. Sabendo que a mdia temporal da intensidade da onda diretamente proporcional ao quadrado da sua amplitude, pode-se afirmar que a amplitude a uma distncia r da fonte proporcional a:

(IME - 2010/2011 - 1 FASE) The history of technology is full of breakthroughs in one field that wound up working wonders in a related one. The 300B vacuum tube, introduced by Western Electric in 1937 to amplify telephone signals, found a far more enduring use as a high-fidelity audio amplifier. The atomic clocks first used in the 1960s by the U.S. military to track Sputnik and later to validate Albert Einsteins relativity theories are now the basis of Global Positioning System. And of course, the magnetron, invented in the 1920s at General Electric and used in radars during World War II, later found itself repurposed as the basis for the microwave oven. According to the text, what is correct to say?