TOPIC :HEAT AND THERMODYNAMICS
Number of questions are 192, Select_Question:

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)