Tolong bantu jawab Pliiisss..

P = 550 w
delta t = 90° – 40° = 50°C
t = 20 menit = 1200 detik
c = 4200 j/kg°C

berarti
energi listrik = kalor
W .listrik = Q
P x t = m x c x delta t
550 x 1200 = m x 4200 x 50
11 x 2 = m x 7
22 = 7m
m = 22/7
m = 3,1 kg
massa = 3,1 kg