A Lei da Gravitação Universal, de Isaac Newton, estabelece a intensidade da força de atração entre duas massas. Ela é representada pela expressão:
onde m1 e m2 correspondem às massas dos corpos, d à distância entre eles, G à constante universal da gravitação e F à força que um corpo exerce sobre o outro.
O esquema representa as trajetórias circulares de cinco satélites, de mesma massa, orbitando a Terra.
Qual gráfico expressa as intensidades das forças que a Terra exerce sobre cada satélite em função do tempo?
Questões relacionadas
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Although robots have made great strides in manufacturing, where tasks are repetitive, they are still no match for humans, who can grasp things and move about effortlessly in the physical world.
Designing a robot to mimic the basic capabilities of motion and perception would be revolutionary, researchers say, with applications stretching from care for the elderly to returning overseas manufacturing operations to the United States (albeit with fewer workers).
Yet the challenges remain immense, far higher than artificial intelligence obstacles like speaking and hearing. “All these problems where you want to duplicate something biology does, such as perception, touch, planning or grasping, turn out to be hard in fundamental ways,” said Gary Bradski, a vision specialist at Willow Garage, a robot development company based in Silicon Valley. “It’s always surprising, because humans can do so much effortlessly.”
Disponível em: http://www.nytimes.com. Acesso em: 18 fev. 2022 (adaptado).
A tecnologia tem avançado bastante nas últimas décadas através da inteligência artificial. O especialista Gary Bradski evidencia que
- Biologia | 13.8 Herança Sexual
(FUVEST 2011 1° FASE) No heredograma abaixo, o símbolo ■ representa um homem afetado por uma doença genética rara, causada por mutação num gene localizado no cromossomo X. Os demais indivíduos são clinicamente normais.
As probabilidades de os indivíduos 7, 12 e 13 serem portadores do alelo mutante são, respectivamente,
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Duda e Carol estavam jogando “Adicionando números”. Carol propôs o desafio: “Se eu juntar a quantidade 7 à minha ficha, o resultado é 19.” Qual era o número que estava escrito na ficha de Carol?
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(UNIFESP) Reducing food waste would mitigate climate change, study shows
April 7, 2016
Reducing food waste around the world would help curb emissions of planet-warming gases, lessening some of the impacts of climate change such as more extreme weather and rising seas, scientists said on Thursday.
Up to of emissions from agriculture in 2050 could be avoided by managing food use and distribution better, according to a new study from the Potsdam Institute for Climate Impact Research (PIK). “Agriculture is a major driver of climate change, accounting for more than of overall global greenhouse gas emissions in 2010,” said co-author Prajal Pradhan. “Avoiding food loss and waste would therefore avoid unnecessary greenhouse gas emissions and help mitigate climate change.”
Between and of food produced around the world is never eaten, because it is spoiled after harvest and during transportation, or thrown away by shops and consumers. The share of food wasted is expected to increase drastically if emerging economies like China and India adopt western food habits, including a shift to eating more meat, the researchers warned. Richer countries tend to consume more food than is healthy or simply waste it, they noted.
As poorer countries develop and the world’s population grows, emissions associated with food waste could soar from gigatonnes (GT) of carbon dioxide equivalent per year to between and GT annually by mid-century, showed the study published in the Environmental Science & Technology journal. It is widely argued that cutting food waste and distributing the world’s surplus food where it is needed could help tackle hunger in places that do not have enough - especially given that land to expand farming is limited.
But Jürgen Kropp, another of the study’s co-authors and PIK’s head of climate change and development, told the Thomson Reuters Foundation the potential for food waste curbs to reduce emissions should be given more attention. “It is not a strategy of governments at the moment,” he said.
No trecho inicial do quarto parágrafo “As poorer countries develop and the world’s population grows”, o termo em destaque tem sentido equivalente, em português, a
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Assaltantes roubam no ABC 135 mil figurinhas da Copa do Mundo
Cinco assaltantes roubaram 135 mil figurinhas do álbum da Copa do Mundo 2010 na noite de quarta-feira (21), em Santo André, no ABC. Segundo a acessoria da Treelog, empresa que distribui os cromos, ninguém ficou ferido durante a ação.
O roubo aconteceu por volta das 23h30. Armados, os criminosos renderam 30 funcionários que estavam no local, durante cerca de 30 minutos, e levaram 135 caixas, cada uma delas contendo mil figurinhas. Cada pacote com cinco cromos custa R$0,75.
Procurada pelo G1, a Panini, editora responsável pelas figurinhas, afirmou que a falta dos cromos em algumas bancas não tem relação com o roubo. Segundo a editora, isso se deve à grande demanda pelas figurinhas.
Disponível em: http://g1.globo.com. Acesso em: 23 abr. 2010 (adaptado).
A notícia é um gênero jornalístico. No texto, o que caracteriza a linguagem desse gênero é o uso de