(UNIT)

A figura representa a variação de temperatura T de uma substância de massa 20,0g, inicialmente no estado sólido, em função do calor recebido Q.

O gráfico de T x Q permite afirmar que o calor latente de fusão, em cal/g, é igual a

“Profundamente identificado com a política saneadora e, principalmente, regeneradora implantada pelo presidente Rodrigues Alves (1902-1906), Pereira Passos foi nomeado o homem forte do projeto que visava fazer da capital da República uma vitrine do discurso civilizatório.”

Julia O'Donnell. A invenção de Copacabana. Culturas urbanas e estilos de vida no Rio de Janeiro. Rio de Janeiro: Zahar, 2013, p. 52.

O “projeto” mencionado no texto envolveu, entre outras iniciativas, 

(UERJ) Uma pirâmide com exatamente seis arestas congruentes é denominada tetraedro regular. Admita que a aresta do tetraedro regular ilustrado a seguir, de vértices ABCD, mede 6 cm e que o ponto médio da aresta BC é M.

O cosseno do ângulo AMD equivale a:

Uma região de uma fábrica deve ser isolada, pois nela os empregados ficam expostos a riscos de acidentes. Essa região está representada pela porção de cor cinza (quadrilátero de área S)  na figura.

Para que os funcionários sejam orientados sobre a localização da área isolada, cartazes informativos serão afixados por toda a fábrica. Para confeccioná-los, programador utilizará um software que permite desenhar essa região a partir de um conjunto de desigualdades algébricas. 

As desigualdades que devem ser utilizadas no referido software, para o desenho da região de isolamento, são:

(UFPR)

Forget Texting While Driving: AT&T Survey reveals drivers do a lot more with their smartphones

By Menchie Mendoza, Tech Times | May 20, 10:10 AM

Drivers who continue to use their smartphones while driving are not only distracted when they call and text. Apart from calling and texting, drivers are also browsing the Internet, tweeting, video chatting, taking selfies and sending email with their devices, according to a study by AT&T.

The research was conducted as part of the carrier's "It Can Wait" campaign launched in 2010. It hopes to increase awareness of the dangers posed by using smartphones while one is behind the wheel. The study polled  U.S. residents ages 16-65 who use their smartphone and drive once or more per day.

Seventy percent of those surveyed admit they use their smartphones for a number of activities while they are driving: 61 percent say they text and 33 percent send email while they are behind the wheel. Posting or interacting on social media is also one of the most common activities that drivers engage in. Using Facebook ranks first on the list, with 27 percent of drivers logging in while driving. Other social media channels that keep drivers "multitasking" include Instagram and Twitter (14 percent) and Snapchat (11 percent).

The results also show that there is a deeper problem involved when people use social media while driving. Among those surveyed, 22 percent blame their addiction to social media.

Other revelations show 62 percent keep their smartphones within easy reach, and that 30 percent of those who post to Twitter while driving do it "all the time". Drivers also don't seem to run out of other activities using their smartphones since most apps are now easily accessed with just a simple tap. Because of this, 28 percent of drivers browse the web; 17 percent take selfies (or groupies); and 10 percent video chat.

"One in 10 say they do video chat while driving", said Lori Lee, AT&T's senior VP for global marketing. "I don't even have words for that". AT&T plans to expand the "It Can Wait" campaign in order to add more focus on the topic of texting while driving by including other driving distractions that result from using the smartphones. "When we launched 'It Can Wait' five years ago, we pleaded with people to realize that no text is worth a life", said Lee. "The same applies to other smartphone activities that people are doing while driving. For the sake of you and those around you, please keep your eyes on the road, not on your phone". AT&T will also launch a nationwide virtual reality tour in summer in order to spread the word that driving and using a smartphone don't and will never mix.

Adapted from <  http://www.techtimes.com/>.   

The word “they”, in boldface and italics, last paragraph, refers to: