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Podemos afirmar que
Dentre os segmentos de reta orientados mostrados na figura (b), o único que pode representar corretamente a força resultante exercida sobre o bloco é o segmento
A distância percorrida pela pedra entre o instante em que foi lançada e o instante em que chegou ao solo foi
TEXTO I
TEXTO I
A tabela abaixo mostra as temperaturas de fusão e ebulição da água, nas escalas Celsius (°C) e Fahrenheit (°F).
Uma temperatura de 20° corresponde, na escala
Fahrenheit, a uma temperatura de:
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)