Physics
A fire truck uses 10,000 litres of water to extinguish a fire, cooling down the burning material from 500°C to 100°C. If the temperature of water increases by 40°C, how much heat energy is absorbed by it? (Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹)
Calorimetry
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Answer
Given,
Volume of water (V) = 10,000 L
Temperature increased (△t) = 40°C = 40 K
Specific heat capacity of water (c) = 4200 J kg⁻¹ K⁻¹
As,
Density of water (d) = 1 Kg/L
Let, Heat absorbed is Q.
From relation,
Substituting the values in the above formula,
Heat absorbed by water is 168 x 107 J.
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