Câu 15.
a. $Q_{toả}=Q_{thu}$
$\Leftrightarrow Q_{toả}=mc\Delta{t}$
$\Leftrightarrow Q_{toả}=1,5.4200.(100-20)$
$\Rightarrow Q_{toả}=504000J$
b. $Q_{toả}=Q_{thu}$
$\Leftrightarrow Q_{toả}=mc\Delta{t}$
$\Leftrightarrow 35$%$.504000=m.880.60$
$\Rightarrow m=3,34kg$