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Um buffet foi contratado para servir 100 convidados em um evento. Dentre os itens do cardápio constava água a 10ºC. Sabendo que o buffet tinha em seu estoque 30 litros de água a 25ºC, determine a quantidade de gelo, em quilogramas, a 0ºC, necessário para obter água à temperatura de 10º C. Considere que a água e o gelo estão em um sistema isolado.
Dados: densidade da água = 1 g/cm3 ;
calor específico da água = 1 cal/g.ºC;
calor de fusão do gelo = 80 cal/g.ºC; e
calor específico do gelo = 0,5 cal/g.ºC
Na figura, O é o centro do semicírculo de raio r = 2cm.
Se A, B e C são pontos do semicírculo e vértices do triângulo isósceles, a área hachurada é _______ cm². (Use π = 3,14 )
Read the cartoon and write (T) for the true statements and (F) for the false statements.
( ) The pilot is fed up with the passengers’ questions.
( ) The pilot is concerned about the in-flight movie and meal.
( ) The passenger is concerned about the in-flight movie and meal.
( ) The pilot and the passenger are engaged in a conversation about flying a jet safely.
Choose the alternative that corresponds to the correct order.
“Must” in bold type (lines 1 and 2) can be correctly
replaced by:
According to the text, write (T) for the true statements and (F) for the false statements.
( ) In 1977 two planes collided in Tenerife.
( ) In 1977 almost 600 people were killed due to heavy fog on the runway.
( ) In 1977 two planes collided when they were heading for Gran Canary airport.
( ) In 1977 two planes were guided to Gran Canary airport because Tenerife was closed.
Choose the alternative that corresponds to the order.
In the cartoon, “hovering” is
Choose the correct alternative to complete the sentence.
After landing safely pilots and crew will have a few days of rest _____.
Choose the alternative that contains the right use of the relative pronoun, in order to write the two sentences below as a single sentence:
That is the teacher. I spoke to her about my grades.
Read the sentences and write T for the correct matching between the phrasal verb and the meaning or F for the incorrect matching:
( ) May I close the door? It is too cold. (ask for permission)
( ) Nobody answers the phone. They must be busy. (obligation)
( ) She should talk to him to apologize. (suggestion)
( ) They might not come for dinner. (prohibition)
Choose the correct alternative:
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