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Duas bolas de 10cm estão presas, uma à outra, por um fio curto de massa desprezível. A de cima, de cortiça, está com metade de seu volume submerso numa camada de óleo (d = 0,92g/cm3); a de baixo, 6 vezes mais densa que a cortiça, possui metade de seu volume imersa no óleo e a outra metade imersa em água. Determine: a) a densidade da cortiça; b) a Tensão no fio.
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