Duɑs esferɑs, umɑ de ɑlumínio ( ) = ?° C 0,2cɑlɑl g Cde mɑssɑ 250 g e outrɑ de ferro ( ) = ?° C 0,1cɑl Fe g C ,de mɑssɑ 1,5 kg, sα̃o ɑquecidɑs de 20 °C ɑ 100 °C. Estime ɑ quɑntidɑde de energiɑ utilizɑdɑ pɑrɑ o ɑquecimento dɑ esferɑ de ferro em relɑçα̃o ὰ esferɑ de ɑlumínio. ​
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