80 g of water at 30°C is poured on a very large block of ice at 0°C. Find mass of ice melted (g). Take L𝒇 = 80 cal/g.
Physics · Mixed Chapter
JEE Main Practice

Question

80 g of water at 30°C is poured on a very large block of ice at 0°C. Find mass of ice melted (g). Take L𝒇 = 80 cal/g.

G1 Physics · Accepted Answer

Step 1: Warm water cools from 30°C to 0°C, giving Q = mcΔT = 80×1×30 = 2400 cal. Step 2: This heat melts ice at constant 0°C: Q = mᵢL𝒇. Step 3: mᵢ = 2400/80 = 30 g.