Please help me to solve this question I tried much thanks

Hello Student,

(1) 2000 J/^oC is the correct option.
30 = mC(T_h-T_l)
30 = mC(50 – 20)
mC = 30/30 =1 W/^oC
Energy transfer per unit time at 40^oC = mC(T_f– T_i) =1 X 20 = 20 W
Energy transfer in 10 sec is, E = 20 x 10 =200 J
Capacity of liquid = E/(40-39.9) = 2000 J/^oC

Regards,
IHE

Approved