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TOPIC :HEAT AND THERMODYNAMICS

Number of questions are 192, Select_Question:

Number of questions are 192, Select_Question:

Q1) Water falls from a height 500m. The rise in temperature of water at bottom if whole of the energy remains in water, will be ( specific heat of water is 4.2 kJ/kg) [AFMC 1997]

SOLUTION

Loss of potential energy converted in to kinetic energy of water molecule or heat energy

∴ Loss of Potential energy=Heat energy

mgh=mcΔθ

500××9.8=m×4.2××103× θ

By substituting the values and solving above equation we get

θ=1.16°C

Answer: (b)