Răspuns :
Cred ca 41900J (Folosindu-te de caldura specifica, ai formula c=Q/m* delta T, c apa = 4190 de aici rezulta ca Q= 4190*2*5)
DeltaT=35-30=5 grade celsius=5 K
c apa =4180J/kg*K
Q=c*m*deltaT=4180J/kg*K *2kg *5K= 41800 J
c apa =4180J/kg*K
Q=c*m*deltaT=4180J/kg*K *2kg *5K= 41800 J