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Uma forma de purificar o sal cloreto de amônio, NH4Cℓ, é a descrita a seguir.
O sal é aquecido, passando diretamente ao estado gasoso, sem passar pelo estado líquido. O gás obtido é resfriado, passando diretamente ao estado sólido, sem passar pelo estado líquido. O sal obtido pelo resfriamento do gás é mais puro do que aquele que foi aquecido.
Esse processo de purificação é conhecido como
Na aula de física, o professor discute com seus alunos a associação de resistores apresentada na figura. Ela é formada por 5 resistores idênticos, ligados à fonte de tensão V.
Durante o experimento, o resistor R3 queima, e, como resultado da medida da intensidade da corrente elétrica que atravessa o resistor R1 , foi obtido valor igual a 4 A.
A medida da intensidade da corrente elétrica que atravessará
os resistores R2
, R4
e R5
será, em ampères, respectivamente,
igual a
Os cadetes cumprem uma rotina intensa composta por diversas atividades. Em uma atividade de campo, foi necessário improvisar, para o aquecimento da água, um coletor solar térmico, composto, dentre outras partes, por uma serpentina por onde circula água pura à vazão de 18 L por hora.
Se ao entrar na serpentina, a temperatura da água, pura, era de 15 °C e atingiu temperatura de 35 °C na saída, a quantidade de energia fornecida à água a cada segundo foi, em J, igual a
Dado: cágua = 4,2 kJ/kg. °C
Utilizado pelo exército, o jeep é um utilitário ágil, de fácil dirigibilidade e capaz de acessar terrenos íngremes, acidentados, com lama ou com outras dificuldades.
Considere o deslocamento de um desses jeeps, de massa igual a 1060 kg, transportando dois militares sobre uma superfície plana e horizontal.
O gráfico ilustra o comportamento da energia cinética do sistema (jeep + militares) em função do quadrado de sua velocidade.
Se os dois militares possuem a mesma massa, conclui-se
que cada militar tem, em kg, massa igual a
Na tabela, são apresentadas informações sobre o número de armas apreendidas pela Polícia Militar do Estado de São Paulo, no segundo semestre de 2018.
Se uma pesquisa utilizar a média aritmética simples do
número de armas apreendidas, mensalmente, no segundo
semestre, pela Polícia Militar do Estado de São Paulo, e outra
pesquisa utilizar a mediana do número de armas apreendidas
no segundo semestre, a diferença entre a mediana e a média
será de
com o objetivo de atingir um
ponto B. Fixando-se como (0, 0) as coordenadas do ponto A
em um sistema de coordenadas cartesianas, cujo eixo das
abscissas, com unidade em metros, representaria o referido
solo, a ordenada do ponto B seria igual a zero, e a abscissa
desse ponto seria igual a 
Com essas 7 peças, sem sobrepô-las, podem-se formar várias figuras, como a de uma casa, a de um gato, a de um cisne, além de figuras geométricas, como a do quadrado, representado acima. Considerando-se todos os ângulos internos das tans, representam-se como α e β as medidas, em graus, do maior e do menor desses ângulos. Nesse caso, α + β corresponde à medida de um ângulo
Em 2015, uma grande empresa petrolífera iniciou o processo de reutilização da água usada para o resfriamento das peças que produzia e fez uma projeção de aumento gradual, em progressão aritmética, até o ano de 2050, do volume de água que será reutilizada, ano a ano.
A tabela apresenta os volumes da água reutilizada, nos primeiros 3 anos:
Considere que An seja o termo geral da progressão aritmética que indique o volume de água reutilizada, em milhões de m3 , com n = 1, representando o volume de água reutilizada no ano de 2016, n = 2, representando o volume de água reutilizada no ano de 2017, e assim sucessivamente.
Nessas condições, tem-se que
What is Interpol?
Founded in 1923, Interpol is an international police organisation made up of 194 member countries. It is not a police force in the traditional sense – its agents are not able to arrest criminals. Instead, it is more of an informationsharing network, providing a way for national police forces to co-operate effectively and tackle international crime ranging from human trafficking and terrorism to money laundering and illegal art dealing.
The organisation, based in France, operates centralised criminal databases that contain fingerprint records, DNA samples and stolen documents: a treasure trove so valuable that police consulted it 146 times every second in 2017. Interpol’s other main function is to issue notices: alerts to member states for missing or wanted persons. The bestknown of these is the “Red Notice”, a notification that a member state would like someone arrested. States are not obliged to follow these notices, but will often treat them as a warrant for someone’s arrest and extradition. “Diffusions”, which can be issued with less bureaucracy, are another popular way of seeking arrests through Interpol.
Notices and diffusions lie at the heart of the organisation’s recent turmoil. Though Interpol’s constitution explicitly forbids any activities of a political character, activists accuse it of failing to enforce this rule.
(www.economist.com/the-economist-explains/2018/11/22/ what-is-interpol. Adaptado)
What is Interpol?
Founded in 1923, Interpol is an international police organisation made up of 194 member countries. It is not a police force in the traditional sense – its agents are not able to arrest criminals. Instead, it is more of an informationsharing network, providing a way for national police forces to co-operate effectively and tackle international crime ranging from human trafficking and terrorism to money laundering and illegal art dealing.
The organisation, based in France, operates centralised criminal databases that contain fingerprint records, DNA samples and stolen documents: a treasure trove so valuable that police consulted it 146 times every second in 2017. Interpol’s other main function is to issue notices: alerts to member states for missing or wanted persons. The bestknown of these is the “Red Notice”, a notification that a member state would like someone arrested. States are not obliged to follow these notices, but will often treat them as a warrant for someone’s arrest and extradition. “Diffusions”, which can be issued with less bureaucracy, are another popular way of seeking arrests through Interpol.
Notices and diffusions lie at the heart of the organisation’s recent turmoil. Though Interpol’s constitution explicitly forbids any activities of a political character, activists accuse it of failing to enforce this rule.
(www.economist.com/the-economist-explains/2018/11/22/ what-is-interpol. Adaptado)
What is Interpol?
Founded in 1923, Interpol is an international police organisation made up of 194 member countries. It is not a police force in the traditional sense – its agents are not able to arrest criminals. Instead, it is more of an informationsharing network, providing a way for national police forces to co-operate effectively and tackle international crime ranging from human trafficking and terrorism to money laundering and illegal art dealing.
The organisation, based in France, operates centralised criminal databases that contain fingerprint records, DNA samples and stolen documents: a treasure trove so valuable that police consulted it 146 times every second in 2017. Interpol’s other main function is to issue notices: alerts to member states for missing or wanted persons. The bestknown of these is the “Red Notice”, a notification that a member state would like someone arrested. States are not obliged to follow these notices, but will often treat them as a warrant for someone’s arrest and extradition. “Diffusions”, which can be issued with less bureaucracy, are another popular way of seeking arrests through Interpol.
Notices and diffusions lie at the heart of the organisation’s recent turmoil. Though Interpol’s constitution explicitly forbids any activities of a political character, activists accuse it of failing to enforce this rule.
(www.economist.com/the-economist-explains/2018/11/22/ what-is-interpol. Adaptado)
What is Interpol?
Founded in 1923, Interpol is an international police organisation made up of 194 member countries. It is not a police force in the traditional sense – its agents are not able to arrest criminals. Instead, it is more of an informationsharing network, providing a way for national police forces to co-operate effectively and tackle international crime ranging from human trafficking and terrorism to money laundering and illegal art dealing.
The organisation, based in France, operates centralised criminal databases that contain fingerprint records, DNA samples and stolen documents: a treasure trove so valuable that police consulted it 146 times every second in 2017. Interpol’s other main function is to issue notices: alerts to member states for missing or wanted persons. The bestknown of these is the “Red Notice”, a notification that a member state would like someone arrested. States are not obliged to follow these notices, but will often treat them as a warrant for someone’s arrest and extradition. “Diffusions”, which can be issued with less bureaucracy, are another popular way of seeking arrests through Interpol.
Notices and diffusions lie at the heart of the organisation’s recent turmoil. Though Interpol’s constitution explicitly forbids any activities of a political character, activists accuse it of failing to enforce this rule.
(www.economist.com/the-economist-explains/2018/11/22/ what-is-interpol. Adaptado)
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