Em Júpiter a aceleração da gravidade vale aproximadamente 25 m/s² (2,5 x maior do que a aceleração da gravidade da Terra). Se uma pessoa possui na Terra um peso de 800 N, quantos newtons esta mesma pessoa pesaria em Júpiter? (Considere a gravidade na Terra g = 10 m/s²).

– A tirinha abaixo utiliza um fenômeno físico para a construção da piada. Que fenômeno é esse?

Uma prensa hidráulica possui ramos com áreas iguais a 15 cm² e 60 cm². Se aplicarmos uma força de intensidade F1=8N sobre o êmbolo de menor área, a força transmitida ao êmbolo de maior área será:

Em qual das alternativas o pronome destacado foi empregado incorretamente?

Uma esfera de 5 kg cai de uma altura de 3,2 metros sobre um dispositivo provido de uma mola de constante elástica 40N/m para amortecer sua queda, como mostra a figura.

Adotando g = 10 m/s² e desprezando o atrito no sistema, pode-se afirmar que a velocidade (v) que a esfera atinge o mecanismo, em m/s, e a contração da mola (x), em metros, valem:

Analisando a figura do gráfico que representa três ondas sonoras produzidas pela mesma fonte, assinale a alternativa correta para os três casos representados.

Rio de Janeiro

In a quick and decisive military sweep, Brazilian security forces seized control of this city’s most notorious slum on Sunday, claiming victory in a weeklong battle against drug gangs that has claimed dozens of lives.

Drug gangs have stained the reputation of this seaside city and contributed heavily to giving it one of the highest murder rates in the world. For the past two years, (1) government has carried out (2) ambitious campaign to pacify (3) most violent slums and regain control of the city in advance of the 2014 World Cup and 2016 Olympic Games. The police have since wrested more than three dozen communities from criminal gangs, installing special community police forces there.

Source: http://www.nytimes.com/2010/11/29/world/americas/29brazil.html?_r=0

Complete the text with the correct article.

A tabela seguinte informa a quantidade de pessoas que compraram ingressos antecipados de um determinado show, cujos preços eram modificados semanalmente. O percentual de pessoas que adquiriram o ingresso por menos de R$ 125,00 foi

Why do planes crash?

Navigational errors are among the most common causes of plane crashes. Planes are flown into a mountain or the sea out of a variety of reasons. Sometimes weather conditions are bad, in other cases pilots have made bad judgements.

In 1996 a Peruvian airliner crashed into the sea after the computer stopped working. The crew had almost no data left to work with and didn't know at which height they were flying when they hit the water.

In 1977 almost 600 people got killed when two planes were heading at full speed towards each other and collided in heavy fog on the runway in Tenerife. The crash happened after planes had been guided to Tenerife because Gran Canary airport was closed.

In June 2009 an Air France airbus disappeared off the coast of Brazil. Although the wreckage was found after a few days it took investigators almost three years to find out what had really happened to the plane.

Pilots are criticising the way planes are ____. In the past decades the structure of planes has changed. More computers and automated systems are taking over, the pilot often has no alternatives left.

(Adapted from http://www.english.online.at/news-articles/technology)

“Wreckage” in bold type, means

Choose the correct alternative to complete the sentence.

After landing safely pilots and crew will have a few days of rest _____.