Question

2007 80 1":ofwater attac 7.A2"glead ball at a temperaturrof842てis placed in alutalerinner Find the equibrium temperature of the system 2 5a 200 gained Coldノrater caro flear Cold - rare hat ler

Answer 1

$m_lC_l(T-T_{eq})=m_wC_w(T_{eq}-T)$ (Conservation of energy)

$0.2\cdot 129\cdot (80-T_{eq})=0.2\cdot 4200\cdot (T_{eq}-20)$

$2064-25.8T_{eq}=840T_{eq}-16800$

$\mathbf{T_{eq}=21.78^{\degree}C}$