Qual deve ser o valor, em kg, da massa m da esfera para que a barra seja mantida na horizontal e em equilíbrio estático?

_____ Monday May 24, 1976, two Concorde jets crossed the Atlantic ocean _____ three hours and fifty minutes. The planes took off and landed _____ the same time.

Source Bonner, Margaret – Grammar Express - Longman

Obs. Considere que o reostato e o aquecedor são resistores ôhmicos.

For generations in the United States, a nineteenth century invention known as the public school system was seen as the best way to give students the knowledge and skills to become nice citizens. Around the 1960s, experts began questioning the system, citing the need for new types of schools to meet the changing demands of the twentieth century. These reformers eventually won for parents a much broader range of educational choices – including religious, alternative, and charter schools and home schooling – but they also sparked a debate on teaching and learning that still divides experts to this day.

A businesswoman’s desperate need for a cigarette on an 8-hour flight from American Airlines ________ in her being arrested and handcuffed, after she was found lighting up in the toilet of a Boeing 747, not once but twice. She ___________ because she _______ violent when the plane landed in England, where the police subsequently arrested and handcuffed her. Joan Norrish, aged 33, yesterday ________ the first person to be prosecuted under new laws for smoking on board a plane, when she was fined £440 at Uxbridge magistrates’ court.

Adapted from Innovations , by Hugh Dellar and Darryl Hocking.

The amount of time people spend watching television is astonishing. On average, individuals in the industrialized world devote three hours a day to the pursuit, fully half of their leisure time, and more than on any single activity save work and sleep. Someone who lives to 75 would spend nine years in front of the tube. To some commentators, this devotion means simply that people enjoy TV and make a conscious decision to watch it. But if that is the whole story, why do so many people experience misgivings about how much they view?

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