Tom tat
V=5l=0,005 m\(^3\)
c=2500 J/kg.k
D=789 Kg/m\(^3\)
t1=20*C
t2=25*C
-----------------
Q= ?
Giai
Ta co
m=D.V=789.0,005 =3,945 kg
Nhiet luong ma ruou can thu vao de nong len la
Q=m.c.(t2-t1)=3,945.2500.(25-20)=49 312,5 J
Vay nhiet luong ma ruou can thu vao de nong len la 49312,5 J