(UNIT) A força gravitacional é a força mútua de atração entre quaisquer dois corpos no Universo. Sobre a Gravitação Universal, é correto afirmar:

Se f(x) = x - 2 e g(x) = x + 1 são funções reais, então o conjunto solução da inequação  é:

(UESC) Uma pequena amostra de cloreto de sódio, NaCl, colocada na argola de um fio de platina, emite luz intensa de coloração laranja, ao ser introduzida na chama de um bico de Bunsen. Considerando-se essas informações sobre o teste de chama de NaCl e com base no modelo atômico de Rutherford-Bohr, é correto afirmar:

Question: Is there anything I can do to train my body to need less sleep?

Karen Weintraub

June 17, 2016

Many people think they can teach themselves to need less sleep, but they’re wrong, said Dr. Sigrid Veasey, a professor at the Center for Sleep and Circadian Neurobiology at the University of Pennsylvania’s Perelman School of Medicine. We might feel that we’re getting by fine on less sleep, but we’re deluding ourselves, Dr. Veasey said, largely because lack of sleep skews our self-awareness. “The more you deprive yourself of sleep over long periods of time, the less accurate you are of judging your own sleep perception,” she said.

Multiple studies have shown that people don’t functionally adapt to less sleep than their bodies need. There is a range of normal sleep times, with most healthy adults naturally needing seven to nine hours of sleep per night, according to the National Sleep Foundation. Those over 65 need about seven to eight hours, on average, while teenagers need eight to 10 hours, and school-age children nine to 11 hours. People’s performance continues to be poor while they are sleep deprived, Dr. Veasey said.

Health issues like pain, sleep apnea or autoimmune disease can increase people’s need for sleep, said Andrea Meredith, a neuroscientist at the University of Maryland School of Medicine. A misalignment of the clock that governs our sleep-wake cycle can also drive up the need for sleep, Dr. Meredith said. The brain’s clock can get misaligned by being stimulated at the wrong time of day, she said, such as from caffeine in the afternoon or evening, digital screen use too close to bedtime, or even exercise at a time of day when the body wants to be winding down. 

Disponível em: http://well.blogs.nytimes.com. Acesso em: 15 set. 2021 (adaptado).

No primeiro parágrafo, a resposta da Drª Sigrid Veasey à questão “Is there anything I can do to train my body to need less sleep?” indica que 

(FATEC) No reino Animalia, o filo dos artrópodes é o mais diversificado do planeta, apresentando mais de 1 milhão de espécies catalogadas, das quais cerca de 900 mil são só de insetos. Entre as características estruturais que garantiram a conquista e a adaptação dos insetos ao meio ambiente terrestre, destaca-se a presença de