Na revelação de uma fotografia analógica, ou seja, de película, uma das etapas consiste em utilizar uma solução reveladora, cuja composição contém hidroquinona.

A função orgânica que caracteriza esse composto é

Nanofibras produzidas a partir da mescla de dois polímeros (cujas siglas são PVDF e PVDF-TrFE) estão ajudando na tecnologia de coletes à prova de balas. Tais coletes funcionam absorvendo a energia do impacto da bala através de colisão inelástica. As nanofibras conseguem absorver 98 Joules por grama, enquanto o tradicional material kevlar absorve 80 Joules por grama. Nessa condição, qual valor de energia cinética um projétil deve ter para que, ao atingir um colete de nanofibra de 0,4kg ultrapasse em 300 Joules a capacidade total de absorção de energia do colete? 

Os gráficos abaixo apresentam a relação entre duas grandezas físicas com a distância. As duas grandezas físicas em questão estão relacionadas a uma esfera condutora, de raio R carregada positivamente

Com base em seus conhecimentos a respeito de eletrostática analise as afirmações abaixo:

(UEFS) A figura abaixo ilustra um corte transversal de determinada célula juntamente com o detalhe de sua parede celular.

A respeito da ultraestrutura presente na parede celular ilustrada, pode-se afirmar que:

(CEFET-MG) The following text was published on the Markkula Center for Applied Ethics website at Santa Clara University. It’s a blog post written by an Ethics teacher. Read it and answer question(s).

The Big Q

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Can You Keep a Secret?

Monday, Mar. 25, 2013

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**DISCLAIMER: All characters and scenarios in this post are fictional.**

Scott couldn’t believe his eyes when he checked Facebook this morning. A new page, “SCU Confessions,” had just been created, and one of the first “confessions” was about him! Someone shared a story where he had gotten really drunk last week and did a few things he wasn’t proud of. Granted, he wasn’t mentioned by name, but it was a unique enough situation that everyone he knew would recognize it as being about him.

Scott had heard about other schools starting pages like this, where people message the page administrator their secrets, hook-up stories, dirty deeds, and anything else that they would want to share anonymously. Scott initially thought these pages were hilarious, and even “liked” the ones from other schools just ¹so that he could be entertained. However, now that he was reading something about him, he felt embarrassed and upset. Already it had 50 “likes” and counting, and several of his friends tagged him in the comments ²so that he would see it. To make matters worse, the post was anonymous, so he had no way of knowing who was spreading the story around.

Scott’s friends told him to laugh it off; it wasn’t that big of a deal. Even he had to admit that the story was objectively pretty funny, and most of the other posts on the page were relatively harmless as well. On the other hand, he could envision how people would take advantage of the anonymity and could potentially cause somebody real harm.

What do you think about Facebook college “Confessions” or “Hook-Up” pages? Do you feel like this type of anonymous sharing can be hurtful and even dangerous, or do you think it’s a harmless way to tell funny stories? Have you ever submitted anything to a page like this, or been mentioned in a post?Posted by Chloe Wilson

Available at: <  http://www.scu.edu/r/ethics-center/ethicsblog/thebigq/15790/ Can-You-Keep-a-Secret?> . Accessed on: April 2013.

The linking word “so that” (ref. 1 e 2) expresses