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Considere as seguintes afirmações:
I) O último nível de energia de um átomo, cujo número quântico principal é igual a 4, pode ter, no máximo, 32 elétrons.
II) No estado fundamental, o átomo de fósforo possui três elétrons desemparelhados.
III) O átomo de nitrogênio é mais eletronegativo que o átomo de flúor.
IV)A primeira energia de ionização do átomo de nitrogênio é menor que a primeira energia de ionização do átomo de fósforo.
V)A configuração eletrônica 1s2 2s1 2p1 x 2p1 y 2p1 z, representa um estado ativado (ou excitado) do átomo de carbono.
Das afirmações feitas, estão corretas
São dadas as seguintes informações relativas às reações que ocorrem à temperatura de 25 °C e à pressão de 1 atm.
Um trenó, de massa M, desce uma montanha partindo do ponto A, com velocidade inicial igual a zero, conforme desenho abaixo.
Uma máquina industrial é movida por um motor elétrico que utiliza um conjunto de duas polias, acopladas por uma correia, conforme figura abaixo. A polia de raio R1= 15 cm está acoplada ao eixo do motor e executa 3000 rotações por minuto. Não ocorre escorregamento no contato da correia com as polias. O número de rotações por minuto, que a polia de raio R2= 60 cm executa, é de
Uma granada de mão, inicialmente em repouso, explodiu sobre uma mesa, de superfície horizontal e sem atrito, e fragmentou-se em três pedaços de massas M1, M2 e M3 que adquiriram velocidades coplanares e paralelas ao plano da mesa, conforme representadas no desenho abaixo. Imediatamente após a explosão, a massa M1=100 g adquire uma velocidade v1= 30m/s e a massa M2=200g adquire uma velocidade v2 = 20 m/s, cuja direção é perpendicular à direção de v1. A massa M3=125g adquire uma velocidade inicial v3 igual a:
Um trabalhador utiliza um sistema de roldanas conectadas por cordas para elevar uma
caixa de massa M = 60 kg. Aplicando uma força 
sobre a ponta livre da corda conforme
representado no desenho abaixo, ele mantém a caixa suspensa e em equilíbrio. Sabendo que as
cordas e as roldanas são ideais e considerando a aceleração da gravidade igual a 10 m/s2, o
módulo da força 
O gráfico abaixo indica a velocidade escalar em função do tempo de um automóvel que se
movimenta sobre um trecho horizontal e retilíneo de uma rodovia.
Dois blocos A e B, de massas MA =5 kg e MB = 3 kg estão dispostos conforme o desenho abaixo em um local onde a aceleração da gravidade vale 10 m/s2 e a resistência do ar é desprezível. Sabendo que o bloco A está descendo com uma velocidade constante e que o fio e a polia são ideais, podemos afirmar que a intensidade da força de atrito entre o bloco B e a superfície horizontal é de
Uma partícula “O” descreve um movimento retilíneo uniforme e está sujeito à ação exclusiva das força 
, conforme o desenho abaixo:
Podemos afirmar que
The Phenomenon of Candy Crush: Why Is the Game So Popular?
In 2012, Candy Crush was released on Facebook and was later converted to smartphone format for people to play on the go. In 2013, the game reached real prominence and became the most popular game on Facebook. It’s no surprise then that so many people play this game on their phones. Candy Crush Saga has changed the way many of us kill time on commutes, or even in the toilet. I don’t remember the last train journey I took where at least one person wasn’t playing Candy Crush on their phone. I’m sure almost every reader of this article will have either been invited or invited others to play Candy Crush via Facebook in an effort to get more lives or even levels.
Despite being incredibly similar to many games over the years, Candy Crush Saga has added new depth to the genre, with seemingly unlimited combinations of new scenarios and concepts. So, this mixture of simplicity and variety is what makes Candy Crush so unbelievably popular.
As a result, Candy Crush Saga shows no signs of slowing down. New levels are generally released via the Facebook version every three weeks, with new levels also being made frequently available for the smartphone version. With 6.7 million active users, the developers are rumoured to be earning $633,000 per day from Candy Crush users.
Adapted from http://metro.co.uk/2013/09/27/
The Phenomenon of Candy Crush: Why Is the Game So Popular?
In 2012, Candy Crush was released on Facebook and was later converted to smartphone format for people to play on the go. In 2013, the game reached real prominence and became the most popular game on Facebook. It’s no surprise then that so many people play this game on their phones. Candy Crush Saga has changed the way many of us kill time on commutes, or even in the toilet. I don’t remember the last train journey I took where at least one person wasn’t playing Candy Crush on their phone. I’m sure almost every reader of this article will have either been invited or invited others to play Candy Crush via Facebook in an effort to get more lives or even levels.
Despite being incredibly similar to many games over the years, Candy Crush Saga has added new depth to the genre, with seemingly unlimited combinations of new scenarios and concepts. So, this mixture of simplicity and variety is what makes Candy Crush so unbelievably popular.
As a result, Candy Crush Saga shows no signs of slowing down. New levels are generally released via the Facebook version every three weeks, with new levels also being made frequently available for the smartphone version. With 6.7 million active users, the developers are rumoured to be earning $633,000 per day from Candy Crush users.
Adapted from http://metro.co.uk/2013/09/27/
The Phenomenon of Candy Crush: Why Is the Game So Popular?
In 2012, Candy Crush was released on Facebook and was later converted to smartphone format for people to play on the go. In 2013, the game reached real prominence and became the most popular game on Facebook. It’s no surprise then that so many people play this game on their phones. Candy Crush Saga has changed the way many of us kill time on commutes, or even in the toilet. I don’t remember the last train journey I took where at least one person wasn’t playing Candy Crush on their phone. I’m sure almost every reader of this article will have either been invited or invited others to play Candy Crush via Facebook in an effort to get more lives or even levels.
Despite being incredibly similar to many games over the years, Candy Crush Saga has added new depth to the genre, with seemingly unlimited combinations of new scenarios and concepts. So, this mixture of simplicity and variety is what makes Candy Crush so unbelievably popular.
As a result, Candy Crush Saga shows no signs of slowing down. New levels are generally released via the Facebook version every three weeks, with new levels also being made frequently available for the smartphone version. With 6.7 million active users, the developers are rumoured to be earning $633,000 per day from Candy Crush users.
Adapted from http://metro.co.uk/2013/09/27/
Brazil’s Rolezinhos – The Kids Are All Right
Mall owners and shopkeepers have reasons to be cautious. A few rolezinhos have led to
muggings and robberies. But most do not end in Itaquera-like chaos: the word’s true meaning is
closer to “little outing”. And theories that rolezeiros are class warriors or favela dwellers tired of
the country’s veiled racism are not correct. “Their battle cry is not ‘Less oppression!’” says Renato
Barreiros, who has directed a documentary about them. “It’s ‘More Adidas!’”
The point of a rolezinho is “to hang out, chill, buy nice things, meet people”, explains Vinicius Andrade, a 17-year-old from Capão Redondo, a favela in western São Paulo. He has taken part in 18 big rolezinhos and helped organise a few, drawing some of his 89,000 Facebook followers. His 15-year-old girlfriend, Yasmin Oliveira, a rolezeiro sweetheart with 94,000 fans of her own on the social network, says that shopping centres make good meeting places because they are safe – an important consideration in a crime-ridden city. There are few other public venues for kids, especially in poorer neighbourhoods.
As well as air conditioning, shopping centres also confer something no open-air space can: status. Rolezeiros enjoy walking around in a branded T-shirt and bermudas, with a pair of 400- reais ($170) shades perched on a baseball cap. Vinicius confesses to spending 800-1,000 reais a month on clothes and accessories, most of what he makes as a helper at a local Adventist church. Just 8% of Itaquera shoppers enjoy a monthly income in excess of 2,780 reais. Some rolezeiros support their flashy lifestyle by reselling outmoded attire to poorer neighbours.
Shopkeepers in the local malls have mixed feelings about the gatherings. On the one hand, the youngsters make ideal clients: they often pay cash and can spend 2,000-3,000 reais in one go. On the other, larger groups can scare away customers.
Adapted from http://www.economist.com
Brazil’s Rolezinhos – The Kids Are All Right
Mall owners and shopkeepers have reasons to be cautious. A few rolezinhos have led to
muggings and robberies. But most do not end in Itaquera-like chaos: the word’s true meaning is
closer to “little outing”. And theories that rolezeiros are class warriors or favela dwellers tired of
the country’s veiled racism are not correct. “Their battle cry is not ‘Less oppression!’” says Renato
Barreiros, who has directed a documentary about them. “It’s ‘More Adidas!’”
The point of a rolezinho is “to hang out, chill, buy nice things, meet people”, explains Vinicius Andrade, a 17-year-old from Capão Redondo, a favela in western São Paulo. He has taken part in 18 big rolezinhos and helped organise a few, drawing some of his 89,000 Facebook followers. His 15-year-old girlfriend, Yasmin Oliveira, a rolezeiro sweetheart with 94,000 fans of her own on the social network, says that shopping centres make good meeting places because they are safe – an important consideration in a crime-ridden city. There are few other public venues for kids, especially in poorer neighbourhoods.
As well as air conditioning, shopping centres also confer something no open-air space can: status. Rolezeiros enjoy walking around in a branded T-shirt and bermudas, with a pair of 400- reais ($170) shades perched on a baseball cap. Vinicius confesses to spending 800-1,000 reais a month on clothes and accessories, most of what he makes as a helper at a local Adventist church. Just 8% of Itaquera shoppers enjoy a monthly income in excess of 2,780 reais. Some rolezeiros support their flashy lifestyle by reselling outmoded attire to poorer neighbours.
Shopkeepers in the local malls have mixed feelings about the gatherings. On the one hand, the youngsters make ideal clients: they often pay cash and can spend 2,000-3,000 reais in one go. On the other, larger groups can scare away customers.
Adapted from http://www.economist.com
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