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2,00 metros.

",{"_23":66,"_61":67,"_63":68},"052a1bec-38f2-4568-8612-10dd6379707a","B","

2,02 metros.

",{"_23":70,"_61":71,"_63":72},"771d55c4-aea5-4913-a347-c03f92d65db3","C","

1,75 metros.

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1,95 metros.

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2,15 metros.

","solution_explanation","A área necessária do fuste é A = N ⁄ σadm = 1800 kN ⁄ 250 kN/m² = 7,2 m². Supondo base circular: D = √(4A/π) ≈ 3,03 m. Para concreto C20 a prática adota espessura da base (altura do tubulão) entre 0,60 D e 0,70 D; usando valor médio 0,65 D: h = 0,65×3,03 ≈ 1,97 m ≅ 1,95 m. Portanto a alternativa (d) é a mais próxima.","statement","

Determine a altura de um tubulão para uma carga de 1800 \\, \\text{kN} e tensão admissível do solo igual a 0,25 \\, \\text{MPa}. Considere concreto \\text{C20}.

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