Questões de EFAF Ciências - Ar

Um processo indicado para a separação de gases do ar, por meio do resfriamento desses componentes com o emprego de baixíssimas temperaturas e/ou elevadas pressões, é a

Caicó é um município situado no nordeste brasileiro. Por se tratar de uma localidade que normalmente registra altas temperaturas, o fenômeno mostrado na charge é atípico.

Fonte: Disponível em: http://3.bp.blogspot.com/_8Us7czZwmqg/SUIwus14I9I/AAAAAAAABwA/7Hqwzj8RfMI/s1600- h/charge-granizo.jpg. Acesso em: 29 dez. 2014.

Nessa charge, o que explica o pedido do sertanejo é o fato de que a água dispersa na atmosfera, em condições meteorológicas adequadas, sofreu um processo de

Breaking records

Both Spirit and Opportunity kept roving long after their warranties expired.

Spirit  nally got bogged down in a sand trap in early 2010. As a result, the rover couldn’t reorient itself to catch the sun during the approaching Martian winter and essentially froze to death.

Opportunity avoided such pitfalls for eight additional years, studying rocks on the rims of four di erent craters, as well as the Meridiani Planum  ats. The rover put 28.06 miles (45.16 km) on its odometer during these travels — more than any other vehicle, robotic or crewed, has traveled on the surface of another world.

Then came the dust storm. In late May 2018, NASA’s Mars Reconnaissance Orbiter saw a storm brewing near Opportunity’s locale, on the rim of the 14-mile-wide (22 km) Endeavour Crater. The maelstrom grew quickly, engul ng the rover and eventually spreading to enshroud the entire planet.

The thick, sunlight-blocking dust prevented the rover from recharging its batteries, and Opportunity went into a sort of hibernation. And it slept without being able to  re up its onboard heaters — a dangerous proposition on frigid Mars, where temperatures can drop enough to break soldering joints and other important pieces of internal hardware.

Something bad apparently did happen: Opportunity hasn’t made a peep since June 10.

“Opportunity likely experienced a low-power fault, a mission clock fault and an up-loss timer fault,” mission team members wrote in a December update.

“We needed a historic dust storm to  nish this historic mission,” MER deputy project scientist Abigail Fraeman, of JPL, said during today’s event.

(Adaptado de: https://www.space.com/mars-rover-opportunity-declared-dead.html Acesso em: 28/04/2019)

What happened to Opportunity?

Há vários fatores que tornam a vida na cidade grande atraente, mas certamente não é o céu estrelado. Ao contarmos as estrelas numa área rural, chegaremos a números muito superiores aos da cidade, caso esta tenha suas ruas e praças bem iluminadas. Isso porque:

Qual o título adequado para o gráfico mostrado abaixo?

Fonte: http://www.risco.com.br/NL/ED/FEV2010.htm