(UNIT)

Considere um bloco com massa de 1,0 kg sendo lançado de um ponto do plano inclinado liso, com velocidade de módulo igual a 2,0 m/s, que percorre a superfície também lisa e atinge uma superfície rugosa com velocidade de módulo igual a 10,0 m/s. Despreze a resistência imposta pelo ar e adote o módulo da aceleração da gravidade local igual a 10,0 m/s².

A altura inicial do bloco, em relação à superfície horizontal, é igual, em m, a

(UERJ) The art of difference

Mutuality in recognizing and negotiating difference is crucial for people to deal with their past and the future; it is also essential in the process of creating a culture of responsibility. How can this be achieved and what is the role of art in this process?

¹A vision based on ideologies solves both challenges of sharing – the interpretation of the past and the projections of the future. But ideologies are somehow “total”, if not totalitarian, because there is not much space for serious public negotiation. Individuals, then, lose their integrity or are restricted to their private spheres and, in the end, their memories become part of the dominant identity discourse, their aspirations are delegated. Even in less obvious systems of ideological rule, where individual subscription to the official story line seems to be consciously voluntary and collective memories are willingly encouraged for the sake of collective identities, the negotiation of difference is often not welcome: exclusion happens quickly ²and non-conformist doubts produce suspicion.

A democratic vision – shared aspirations for the future, based on negotiated interpretations of the past that respect diversity – is necessarily found in complex processes of private and public discourse and participatory and inclusive culture. Yet, politics tends to reduce complexity and engineer the balance between the individual and the collective rather than invest in processes of negotiation. We have learned, ¹¹though, that this social engineering is a phantasm, largely limited and limiting, and, even if successful, often creates paranoid and fatal structures of homogeneity by trying to mould memories and hopes.

Humankind has gathered impressive knowledge about the limitations of the human will and the failures of such “engineering”. ¹²Nevertheless, despite this, and maybe even because of it, we cannot give up trying the ³impossible: to create conditions for equality and solidarity for individuals to flourish. These conditions should be accompanied by narratives of a just, fair and free commonwealth of all. If history and memory seem to make this dream an ⁴unlikely scenario, can art play this part?

The role of art is precisely to keep inspiration alive, to deconstruct ideology, to ⁵recall the necessary dream of freedom, of the individual and of the common good beyond the “either/or” and beyond simplicity. In this sense, art in general prevents false hopes, and thus generates hope in the most paradoxical way: the only way of hoping that reaches beyond the private sphere without some kind of ideological distortion.

What makes art so unique? And why? Because the best narratives of art are purpose-free, uniquely non-instrumental, simply human. Art narrates what we don’t understand in ⁷enlightened ways. Artists in particular offer a wealth of ⁶unseen perspectives and ⁸unexpected pathways of human exploration. Art makes us aware that all memories are personal, despite the power of collective narratives. Arts and culture empower people to think freely, to imagine the ⁹unimagined, to feel responsible across borders and boundaries. Hopefully, the narratives of the future will be ¹⁰intercultural – and art will be the ally in the art of difference that needs to be further developed. “Art is about difference, art is difference”, as stated by Igor Dobricic*. And it is difference that will be at the origin of the new bonding narratives of confidence.

Gottfried Wagner alliancepublishing.org

The ideas expressed in a text might be perceived as true because of the choice and repetition of a specific tense.

The verb tense that makes the ideas in the text seem true is:

(ACAFE) A previsão do tempo feita em noticiários de TV e jornais costuma exibir mapas mostrando áreas de chuva forte. Esses mapas são, muitas vezes, produzidos por um radar Doppler, que tem tecnologia muito superior à do radar convencional. Os radares comuns podem indicar apenas o tamanho e a distância de partículas, tais como gotas de chuva. O radar Doppler é capaz, além disso, de registrar a velocidade e a direção na qual as partículas se movimentam, fornecendo um quadro do fluxo do vento em diferentes elevações. 

Fonte: Revista Scientific American Brasil, seção: Como funciona. Ano 1, N 8, Jan 2003, p. 90-91.(Adaptado)

O radar Doppler funciona com base no fenômeno da:

(UNIT) Um bloco de ferro de 200,0g, cuja densidade é igual a 7,8 g/cm³, está suspenso por um dinamômetro e totalmente submerso em um fluido de massa específica d. Considerando-se que a indicação do dinamômetro é de 1,2N e o módulo da aceleração da gravidade local igual a 10 m/s², é correto afirmar que o valor de d, em g/cm³, é igual a

Uma pessoa estava organizando o seu escritório e, para aproveitar o espaço embaixo da escada, colocou três caixas nessa área. As faces laterais das caixas são quadradas, sendo que o lado da caixa maior mede 12 dm e o lado da caixa menor mede 3 dm. Sabe-se que a escada toca em uma aresta de cada caixa de maneira que, na visão lateral, são formados dois triângulos A e B semelhantes, como mostra a imagem a seguir fora de escala.