Questões de Concurso

 

   Mining trucks are monstrous machines that guzzle fuel at a scarcely believable rate. Weighing 220 tonnes, they can get through 134 litres of diesel every hour. Little wonder then that mining companies are focusing their attention on these vehicles as the first step to reducing their carbon footprint.

    Anglo American, in collaboration with several partners, is retrofitting a mining haul truck with hydrogen power technology. A first of its kind, the monster mining vehicle is being piloted in Limpopo, South Africa, at the firm’s Mogalakwena platinum mine. Due to be launched early 2022, the truck will be hybrid, with a hydrogen fuel cell providing roughly half of the power and a battery pack the other half.

    Instead of having a tank of diesel that powers the motor, hydrogen enters the fuel cell and mixes with oxygen to create water in a chemical reaction catalysed by platinum, which generates the electricity needed to power the motors that drive the wheels. By rolling out this technology across its global truck fleet, Anglo American says it will be “taking the equivalent of half a million diesel cars ‘off the road”.  

    The construction sector, which includes mining, accounted for 39% of energy-related CO2 emissions in 2017, according to Davide Sabbadin, from the European Environmental Bureau. He says the sector will need to reduce its energy consumption by a third if it hopes to be compatible with the Paris Agreement. “While electric-powered vehicles, generally speaking, are less damaging to the environment than internal combustion engines on a life cycle analysis, this does not mean that they are green,” he says. It all hinges on how the hydrogen is produced. Some hydrogen is created using fossil fuels, which of course means there are substantial emissions as a result. “We should refrain from presenting hydrogen as a technological solution to all problems… all forms of hydrogen come at an environmental cost – water use, impacts on nature,” says Mr Sabbadin.

(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)

 

   Mining trucks are monstrous machines that guzzle fuel at a scarcely believable rate. Weighing 220 tonnes, they can get through 134 litres of diesel every hour. Little wonder then that mining companies are focusing their attention on these vehicles as the first step to reducing their carbon footprint.

    Anglo American, in collaboration with several partners, is retrofitting a mining haul truck with hydrogen power technology. A first of its kind, the monster mining vehicle is being piloted in Limpopo, South Africa, at the firm’s Mogalakwena platinum mine. Due to be launched early 2022, the truck will be hybrid, with a hydrogen fuel cell providing roughly half of the power and a battery pack the other half.

    Instead of having a tank of diesel that powers the motor, hydrogen enters the fuel cell and mixes with oxygen to create water in a chemical reaction catalysed by platinum, which generates the electricity needed to power the motors that drive the wheels. By rolling out this technology across its global truck fleet, Anglo American says it will be “taking the equivalent of half a million diesel cars ‘off the road”.  

    The construction sector, which includes mining, accounted for 39% of energy-related CO2 emissions in 2017, according to Davide Sabbadin, from the European Environmental Bureau. He says the sector will need to reduce its energy consumption by a third if it hopes to be compatible with the Paris Agreement. “While electric-powered vehicles, generally speaking, are less damaging to the environment than internal combustion engines on a life cycle analysis, this does not mean that they are green,” he says. It all hinges on how the hydrogen is produced. Some hydrogen is created using fossil fuels, which of course means there are substantial emissions as a result. “We should refrain from presenting hydrogen as a technological solution to all problems… all forms of hydrogen come at an environmental cost – water use, impacts on nature,” says Mr Sabbadin.

(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)

Leia o texto a seguir e responda à questão.

RUN TO THE HILLS

Iron Maiden

White man came across the sea

He brought us pain and misery

He killed our tribes; he killed our creed

He took our game for his own need

We fought him hard, we fought him well

Out on the plains we gave him hell

But many came, too much for

Cree Oh, will we ever be set free?

Riding through dust clouds and barren wastes

Galloping hard on the plains

Chasing the redskins back to their holes

Fighting them at their own game

Murder for freedom the stab in the back

Women and children and cowards, attack!

Run to the hills

Run for your lives

Soldier blue in the barren wastes

Hunting and killing their game

Raping the women and

wasting the men

The only good Indians are tame

Selling them whiskey and taking their gold

Enslaving the young and destroying the old

Leia o texto a seguir e responda à questão.

RUN TO THE HILLS

Iron Maiden

White man came across the sea

He brought us pain and misery

He killed our tribes; he killed our creed

He took our game for his own need

We fought him hard, we fought him well

Out on the plains we gave him hell

But many came, too much for

Cree Oh, will we ever be set free?

Riding through dust clouds and barren wastes

Galloping hard on the plains

Chasing the redskins back to their holes

Fighting them at their own game

Murder for freedom the stab in the back

Women and children and cowards, attack!

Run to the hills

Run for your lives

Soldier blue in the barren wastes

Hunting and killing their game

Raping the women and

wasting the men

The only good Indians are tame

Selling them whiskey and taking their gold

Enslaving the young and destroying the old

Leia o texto a seguir e responda à questão.

RUN TO THE HILLS

Iron Maiden

White man came across the sea

He brought us pain and misery

He killed our tribes; he killed our creed

He took our game for his own need

We fought him hard, we fought him well

Out on the plains we gave him hell

But many came, too much for

Cree Oh, will we ever be set free?

Riding through dust clouds and barren wastes

Galloping hard on the plains

Chasing the redskins back to their holes

Fighting them at their own game

Murder for freedom the stab in the back

Women and children and cowards, attack!

Run to the hills

Run for your lives

Soldier blue in the barren wastes

Hunting and killing their game

Raping the women and

wasting the men

The only good Indians are tame

Selling them whiskey and taking their gold

Enslaving the young and destroying the old