Question

t1=40C
t2=20C
p=1000кг/м^3
V=4×10^-4кг
c=4200
m-? Q-?

Answer 1

Q=cm*(t1-t2)
m=pV
m=1000*0.0004=0.4(кг)
Q=4200*0.4*20=33600(ДЖ)=33.6(кДЖ)