Verified Solution • 2025–26 Session moderate

QPages 62-64: Q19: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Pages 62-64: Q19 Solution: Find the change in the internal energy of 2 kg of water as it…

Find the change in the internal energy of 2 kg of water as it is heated from 0�C to 4�C. The specific heat capacity of water is

4200 \text{ J kg}^{-1} \text{ K}^{-1}

and its densities at 0�C and 4�C are

999.9 \text{ kg m}^{-3}

and

1000 \text{ kg m}^{-3}

respectively. Atmospheric pressure =

10^5 \text{ Pa}

.

Step-by-Step Verified Solution

**Answer:**

\Delta U = 33600

J. **Step-by-Step Explanation:** Given:

m = 2

kg,

\Delta T = 4

K,

c = 4200

J/kg-K.

\Delta U = mc\Delta T = 2 \times 4200 \times 4 = 33600

J.

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