Question

lm hộ mk câu 3

Answer 1

Câu 3: 

a) Ta có:\(Q=Q_{Al}+Q_{nước}=0,3\cdot880\cdot\left(100-30\right)+1,75\cdot4200\cdot\left(100-30\right)=532980\left(J\right)\)

b Ta có: \(Q_{thu}=Q_{tỏa}\)

\(\Rightarrow0,15\cdot380\cdot\left(150-t\right)=0,7\cdot4200\cdot\left(t-30\right)\)

\(\Rightarrow t\approx32,28^oC\)