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Exercício de Quantos feijões cabem em 1 litro?
Exercício:
Supondo que um grão de feijão ocupe o espaço equivalente a um paralelepípedo de arestas 0,5 cm x 0,5 cm x 1,0 cm, qual das alternativas abaixo melhor estima a ordem de grandeza de número de feijões contido no volume de um litro?
a) 10
b) 10²
c) 10³
d) 104
e) 105
Informações Adicionais:
🙂
0,5 cm x 0,5 cm x 1,0 cm, = 0,25 cm³ (espaço ocupado por 1 feijão )
Sabendo que 0,001 m³ corresponde a 1 litro
posso calcular que 1000 cm³ corresponde a 1 litro
logo 1000 cm³ / 0,25 cm³ = 4000 ou seja 104 resposta correta alternativa D
pq 104, eu acho que o correto é 103
acho que é 103,pq quando dividimos da 4000 andamos a virgula 3 vezes entao e 103 🙂
A resposta correta é letra d 🙂
vocês estão certos 4000 transformando na base dez da 103,mais em ordem de grandeza é 104 conforme a questão pede, então a resposta correta é a letra D.
Eu também estava em dúvida no 10^4, pois não tinha transformado em grandeza que ficaria 10^5. Só agora que vim ver que na verdade é 10^3, e o 10^4 já tá convertido..
Juro que pra mim ainda parece que 10^3 que está certo. Não entendi, alguém poderia explicar pq é 10^4?
Partindo da notação científica, N.10^n, procede-se assim: Se N q multiplica a potência de 10 for igual ou maior que √10 (aproximadamente:3,16)974ddz, utiliza-se como ordem de grandeza 10^n+1, se for menor que √10usa a mesma potencia 10^n.
espera ai
dm³ cm³ mm
000 000 250
certo?? essa é a tabela do volume do feijão
entao o volume é de 0,0000025 dm³ ou litros
se 0,0000025 L tem 1 feijao, 1 L tem X
1feijao——–0,0000025 LX—————–1 L
X= 1/0,0000000025 = 400000 = 4.105
ou seja respota E
Como está pedindo na ordem de grandeza é 10^4 , pois o 4 é maior que 3,16
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