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JAMB Physics 1980 Question 15

Question 15

Quantity of Heat

The water at the bottom of a waterfall is slightly warmer than that at the top because part of the

  1. A.potential energy raises the water temperature
  2. B.water absorbs latent heat from the atmosphere
  3. C.kinetic energy is changed into internal energy
  4. D.dropping mass of water increases the heat capacity
  5. E.A and C above.
Show the answer and explanation

Answer: C (kinetic energy is changed into internal energy)

Explanation

As the water falls its potential energy becomes kinetic energy; when it strikes the bottom, part of that kinetic energy becomes internal (heat) energy, warming it slightly.