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Many South Africans remain poor and unemployment is high − a factor blamed for a wave of violent attacks against migrant workers from other African countries in 2008 and protests by township residents over poor living conditions during the summer of 2009.
Land redistribution is a crucial problem that continues existing. Most farmland is still white-owned. ________ land acquisition on a "willing buyer, willing seller" basis, officials have signaled that large-scale expropriations are on the cards. The government aims to transfer 30% of farmland to black South Africans by 2014.
http://news.bbc.co.uk/2/hi/africa/country_profiles/1071886.stm
Many South Africans remain poor and unemployment is high − a factor blamed for a wave of violent attacks against migrant workers from other African countries in 2008 and protests by township residents over poor living conditions during the summer of 2009.
Land redistribution is a crucial problem that continues existing. Most farmland is still white-owned. ________ land acquisition on a "willing buyer, willing seller" basis, officials have signaled that large-scale expropriations are on the cards. The government aims to transfer 30% of farmland to black South Africans by 2014.
http://news.bbc.co.uk/2/hi/africa/country_profiles/1071886.stm
According to the cartoon, FIFA
When football _____ professional in South Africa in 1959, 12 clubs broke from the amateur ranks. However, in the strict days of Apartheid, these pioneers _____ whites-only organizations and _____ today, all but a few, defunct. One of the survivors is Arcadia from Tshwane/ Pretoria, an outfit that today competes in the amateur ranks and concentrates on junior football.
http://www.fifa.com/worldcup
When football _____ professional in South Africa in 1959, 12 clubs broke from the amateur ranks. However, in the strict days of Apartheid, these pioneers _____ whites-only organizations and _____ today, all but a few, defunct. One of the survivors is Arcadia from Tshwane/ Pretoria, an outfit that today competes in the amateur ranks and concentrates on junior football.
http://www.fifa.com/worldcup
No time to relax
Even when we relax we do everything more quickly. Ten years ago when people went to art galeries they spend ten seconds looking at each picture. Today they spend just three seconds!
Oxford, New English File
According to the paragraph
Rosana Fisher works at an outdoor activities centre on the west coast of Scotland. She teaches mountain climbing, scuba diving and hang-gliding. She's talking to some young people who've just arrived at the centre:
I - 'You can't do any of the activities unless you're with an instructor.'
II - 'We won't let you start an activity if you don't have the correct equipment.'
III - 'You can't go scuba diving unless you've done the training course.'
IV - 'Remember you can't leave the centre unless you say where you're going.'
English Grammar in Steps - Richmond
Rosana Fisher works at an outdoor activities centre on the west coast of Scotland. She teaches mountain climbing, scuba diving and hang-gliding. She's talking to some young people who've just arrived at the centre:
I - 'You can't do any of the activities unless you're with an instructor.'
II - 'We won't let you start an activity if you don't have the correct equipment.'
III - 'You can't go scuba diving unless you've done the training course.'
IV - 'Remember you can't leave the centre unless you say where you're going.'
English Grammar in Steps - Richmond
Mark the option which shows another way to rewrite the conditional sentences above, correctly.
I - You can do none of the activities if you don't be with an instructor.
II - We will not let you start an activity unless you have the correct equipment.
III - You cannot going scuba diving if you haven't done the training course.
IV - Remember you can't leave the centre if you don't say where
you go.
* Quando necessário, use g=10 m/s²,
sen 30° = cos 60° = 1/2 ,
sen 60° = cos 30° = √3/2 ,
sen 45° = cos 45° = √2/ 2 .
Considere a palavra ACADEMIA parcialmente vista de cima por um observador através de uma lente esférica gaussiana, como mostra a figura abaixo.
Estando todo o conjunto imerso em ar, a lente que pode
representar a situação é
* Quando necessário, use g=10 m/s²,
sen 30° = cos 60° = 1/2 ,
sen 60° = cos 30° = √3/2 ,
sen 45° = cos 45° = √2/ 2 .
O bloco da Figura 1 entra em movimento sob ação de uma força resultante de módulo F que pode atuar de três formas diferentes, conforme os diagramas da Figura 2.
Com relação aos módulos das velocidades v1, v2 e v3 atingidas
pelo bloco no instante t = 2 s, nas três situações descritas,
pode-se afirmar que
* Quando necessário, use g=10 m/s²,
sen 30° = cos 60° = 1/2 ,
sen 60° = cos 30° = √3/2 ,
sen 45° = cos 45° = √2/ 2 .
A figura abaixo representa três formas distintas para um bloco entrar em movimento.
Sabe-se que as forças 
são constantes e de mesma
intensidade. Desprezando-se qualquer resistência, pode-se
afirmar que, depois de percorrida uma mesma distância, a
energia cinética, E1 , E2 e E3 , adquirida em cada situação,
é tal que
* Quando necessário, use g=10 m/s²,
sen 30° = cos 60° = 1/2 ,
sen 60° = cos 30° = √3/2 ,
sen 45° = cos 45° = √2/ 2 .
Um carro percorre uma curva circular com velocidade linear constante de 15 m/s completando-a em 5√2 s, conforme figura abaixo.
É correto afirmar que o módulo da aceleração média
experimentada pelo carro nesse trecho, em m/s², é
* Quando necessário, use g=10 m/s²,
sen 30° = cos 60° = 1/2 ,
sen 60° = cos 30° = √3/2 ,
sen 45° = cos 45° = √2/ 2 .
O gráfico da posição (S) em função do tempo (t) a seguir representa o movimento retilíneo de um móvel.
A partir do gráfico é correto afirmar que,
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