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Q.

 Find the change in the internal energy of 2kg of water as it is heated from 0°C to 4°C. The specific heat capacity of water is 4200J/kg-K and its densities at 0°C and 4°C are 999.9kg/m3 and 1000kg'm3, respectively. Atmospheric pressure =105Pa.

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a

33600.02J

b

25800.02J

c

96300.02J

d

11800.02J

answer is D.

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Detailed Solution

Vi=mρt=2999.9=2.0002×10-3m3

Vf=mρf=21000=2×10-3m3

ΔU=Q-W

=msΔθ-pdΔV

=(2)(4200)(4)-(10)5-0.0002×10-3

=33600.02J

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