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Observe o desenho abaixo, que mostra um cubo de 10cm de lado, parcialmente submerso em água.
Assumindo que a densidade da água vale 1g/cm3
, o peso
desse cubo vale:
Observe a gangorra abaixo, em cujas extremidades se apoiam duas pessoas, cujos pesos são identificados pelos símbolos P1 e P2.
Se o peso da primeira pessoa (P1) vale 60kgf, o peso que a
segunda pessoa deve ter (P2) para que a gangorra fique
em equilíbrio, na posição horizontal, vale:
Observe o sistema de forças abaixo, que atua sobre o corpo M:
O módulo da força resultante desse sistema vale:
TEXT II
The four-thousand-year-old computer
In 1901, a group of divers excavating an ancient Roman shipwreck near the island of Antikythera, off the southern coast of Greece, found a mysterious object - a lump of calcified stone that contained within it several gearwheels welded together after years under the sea. The 2,000-year-old object, no bigger than a modern laptop, is now regarded as the world's oldest computer, devised to predict solar eclipses and, according to recent findings, calculate the timing of the ancient Olympics. Following the efforts of an international team of scientists, the mysteries of the Antikythera Mechanism are uncovered, revealing surprising and awe-inspiring details of the object that continues to mystify.
(From: http://www.bbc.co.uk/programmes/b01hlkcq)
TEXT II
The four-thousand-year-old computer
In 1901, a group of divers excavating an ancient Roman shipwreck near the island of Antikythera, off the southern coast of Greece, found a mysterious object - a lump of calcified stone that contained within it several gearwheels welded together after years under the sea. The 2,000-year-old object, no bigger than a modern laptop, is now regarded as the world's oldest computer, devised to predict solar eclipses and, according to recent findings, calculate the timing of the ancient Olympics. Following the efforts of an international team of scientists, the mysteries of the Antikythera Mechanism are uncovered, revealing surprising and awe-inspiring details of the object that continues to mystify.
(From: http://www.bbc.co.uk/programmes/b01hlkcq)
TEXT II
The four-thousand-year-old computer
In 1901, a group of divers excavating an ancient Roman shipwreck near the island of Antikythera, off the southern coast of Greece, found a mysterious object - a lump of calcified stone that contained within it several gearwheels welded together after years under the sea. The 2,000-year-old object, no bigger than a modern laptop, is now regarded as the world's oldest computer, devised to predict solar eclipses and, according to recent findings, calculate the timing of the ancient Olympics. Following the efforts of an international team of scientists, the mysteries of the Antikythera Mechanism are uncovered, revealing surprising and awe-inspiring details of the object that continues to mystify.
(From: http://www.bbc.co.uk/programmes/b01hlkcq)
TEXT II
The four-thousand-year-old computer
In 1901, a group of divers excavating an ancient Roman shipwreck near the island of Antikythera, off the southern coast of Greece, found a mysterious object - a lump of calcified stone that contained within it several gearwheels welded together after years under the sea. The 2,000-year-old object, no bigger than a modern laptop, is now regarded as the world's oldest computer, devised to predict solar eclipses and, according to recent findings, calculate the timing of the ancient Olympics. Following the efforts of an international team of scientists, the mysteries of the Antikythera Mechanism are uncovered, revealing surprising and awe-inspiring details of the object that continues to mystify.
(From: http://www.bbc.co.uk/programmes/b01hlkcq)
TEXT II
The four-thousand-year-old computer
In 1901, a group of divers excavating an ancient Roman shipwreck near the island of Antikythera, off the southern coast of Greece, found a mysterious object - a lump of calcified stone that contained within it several gearwheels welded together after years under the sea. The 2,000-year-old object, no bigger than a modern laptop, is now regarded as the world's oldest computer, devised to predict solar eclipses and, according to recent findings, calculate the timing of the ancient Olympics. Following the efforts of an international team of scientists, the mysteries of the Antikythera Mechanism are uncovered, revealing surprising and awe-inspiring details of the object that continues to mystify.
(From: http://www.bbc.co.uk/programmes/b01hlkcq)
TEXT I
The Environmental Pillar of Sustainable Water: Ecological Services
Across the globe, increased demand and water mismanagement have put stress on water services. As a result, there has been a growing societal recognition of the need to look at sustainable solutions that allow for everyone to have access to clean water. There is growing recognition of the importance of ecological services (benefits arising from the ecological functions of healthy ecosystems) as part of a management strategy in new approaches. Ecological services imply that nature can also play a role in providing safe drinking water. Whether through source water protection or natural filtration, the environment can work in concert with technology to provide water in a reasonable, sustainable fashion.
(From: http://www.ncbi.nlm.nih.gov/books/NBK50775/)
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