NDA 2026 Physics question
A 5 g piece of ice at –20 °C is put into kg of water at 30 °C temperature. The heat is exchanged only between the ice and the water. The final temperature of the mixture is 0 °C in liquid phase. What is the value of in kg?
Answer: (C)
Solution
Heat needed by the ice: to warm from –20 °C to 0 °C, ; to melt, ; total 450 cal. Heat given by water cooling from 30
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