NCERT Exercise 10.17 - Thermal Properties of Matter
Question: A cubical thermacole icebox (side 30 cm, thickness 5 cm, K = 0.01 J/(s m K)) holds 4 kg ice. Outside 45 C. Estimate ice remaining after 6 h. L_f = 335 x 10^3 J/kg.
Answer: Ice remaining = **about 3.69 kg**.
Full step-by-step NCERT solution with diagrams on Something by Zero.