Analise a figura a seguir.

Considere um cabo composto de dois segmentos, 1 e 2, sendo que a densidade do segmento 2 é menor que a do segmento 1. Suponha que uma onda seja gerada na extremidade A do segmento 1, conforme indica a figura acima. Após a onda atingir o ponto P e comparando os parâmetros V (velocidade) , F(frequência) e L(comprimento de onda) das ondas incidente e refratada, pode-se afirmar que

Observe o gráfico a seguir.

O gráfico acima mostra o fluxo magnético, em função do tempo, que atravessa um anel metálico. Sendo a resistência elétrica do anel igual a 0,3!$ Ω !$, a corrente elétrica que o percorre é, em miliampere, igual a

"She has tried to reach them four times on the phone without success. Hence she needs to write them as her last option." The underlined connective expresses the idea of:

Observe a figura a seguir.

Dois corpos A e B são aquecidos separadamente por fontes de calor idênticas. A massa do corpo A é 200g e a do corpo B é 800g. Analisando o gráfico, que mostra a temperatura do corpo em função do tempo de ação da fonte, verifica-se que o calor específico do corpo A (C_A) e o calor específico do corpo B (C_B) obedecem a relação

Observe a figura a seguir.

Uma partícula de carga negativa q e massa m penetra com velocidade v pelo orifício X em uma região de campo magnético uniforme, e desta região sai pelo orifício Y, conforme indica a figura acima. Observe que a velocidade da partícula é perpendicular às linhas de campo magnético. Desprezando os efeitos gravitacionais e considerando (q/m)=1,2.10¹¹C/kg, B=1,0.10^-2T e v=6,0.10⁶m/s, a distância D entre os orifícios X e Y é igual a quantos milímetros?

Considere o raio da Terra igual a 6,39.10³km. Para que a aceleração da gravidade sobre um foguete seja 19% menor do que o seu valor na superfície da Terra, o foguete deverá atingir a altitude, em quilômetros, de

João construiu um círculo de papel com centro O e raio 4cm (Figura 1). Traçou dois diâmetros AC e BD perpendiculares e, em seguida, dobrou o papel fazendo coincidir A, O e C, conforme sugere a Figura 2.

A área da parte do círculo naõ encoberta pelas dobras, sombreada na Figura2, é igual a

Analise as afirmativas abaixo.

I - Seja k o conjunto dos quadriláteros planos, seus subconjuntos são:

P = { x !$ ∈ !$ k / x possui lados opostos paralelos };

L = { x !$ ∈ !$ k / x possui 4 lados congruentes };

R = { x !$ ∈ !$ k / x possui 4 ângulos retos }; e

Q = { x !$ ∈ !$ k / x possui 4 lados congruentes e 2 ângulos com medidas iguais }.

Logo, L !$ ∩ !$ R = L !$ ∩ !$ Q.

II - Seja o conjunto A={1,2,3,4}, nota-se que A possui somente 4 subconjuntos.

III - Observando as seguintes relações entre conjuntos: {a,b,c,d} Uz={a,b,c,d,e}, {c,d} Uz= {a,c,d,e} e {b,c,d} !$ ∩ !$z={x}; pode-se concluir que Z={a,c,e}.

Em relação as afirmativas acima, assinale a opção correta.

Choose the correct alternative to complete the statements.

I - They the search after three hours. It was hopeless.

II - Somebody's got to those high principles.

III - We shouldn't their arguments so easily.

IV - I'm trying to my own work.

V - What a preposterous idea! Jane will never with it!

NATO ships, helicopters hunt down 7 pirates

NAIROBI, Kenya - NATO warships and helicopters pursued Somali pirates for seven hours after they attacked a Norwegian tanker, NATO spokesmen said Sunday, and the highspeed chase only ended when warning shots were fired at the piratesl skiff. Seven pirates attempted to attack the Norwegian-flagged MV Front Ardenne late Saturday but fled after crew took evasive maneuvers and alerted warships in the area, said Portuguese Lt. Cmdr. Alexandre Santos Fernandes, aboard a warship in the Gulf of Aden, and Cmdr. Chris Davies, of NATO'S maritime headquarters in England.

"How the attack was thwarted is unclear, it appears to have been the actions of the tanker," Davies said. Fernandes said no shots were fired at the tanker.

Davies said the pirates sailed into the path of the Canadian warship Winnipeg, which was escorting a World Food Program delivery ship through the Gulf of Aden. The American ship USS Halyburton was also in the area and joined the chase.

"There was a lengthy pursuit, over said. The pirates hurled weapons into Canadian and U.S. warships closed in. NATO'S anti-piracy mission.

"The skiff abandoned the scene and tried to escape to Somali territory," Fernandes said. "It was heading toward Bossaso but we managed to track them. Warning shots have been made after several attempts to stop the vessel."

Both ships deployed helicopters, and naval officers hailed the pirates over loudspeakers and finally fired warning shots to stop them, Fernandes said, but not before the pirates had dumped most of their weapons overboard. NATO forces boarded the skiff, where they found a rocketpropelled grenade, and interrogated, disarmed and released the pirates.

The pirates cannot be prosecuted under Canadian law because they did not attack Canadian citizens or interests and the crime was not committed on Canadian territory.

"When a ship is part of NATO, the detention of a person is a matter for the national authorities," Fernandes said. "It stops being a NATO issue and starts being a national issue."

The pirates' release underscores the difficulties navies have in fighting rampant piracy off the coast of lawless Somalia. Most of the time, foreign navies simply disarm and release the pirates they catch due to legal complications and logistical difficulties in transporting pirates and witnesses to court.

Pirates have attacked more than 80 boats this year alone, four times the number assaulted in 2003, according to the Kuala Lumpur-based International Maritime Bureau. They now hold at least 18 ships - including a Belgian tanker seized Saturday with 10 crew aboard - and over 310 crew hostage, according to an Associated Press count.

(Adapted from: www.ap.org, 04/19/09)

"The economic downturn has affected many households in the United States. U.S. homeowners have continued investing their money in the stock market though". The underlined connective expresses the idea of: