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Um bloco de cobre que pesa 0,2kg tem uma temperatura inicial de 400K; 4 kg de água queestão inicialmente a 300K encontram-se num reservatório, de cobre, perfeitamente isoladotermicamente cuja massa é igual a 0,5kg. O bloco de cobre é colocado em contato com a águae o sistema fica em repouso até atingir o equilíbrio. Qual será a variação de energia interna dobloco e da água? Qual é a variação total de energia interna inclusive a do tanque? Ignoreefeitos de expansão e contração, assuma que os calores específicos são constantes e iguais a4,184 J/gK para a água e 0,380 J/gK para o cobre.

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