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Homework Help: Calculate Delta T expected from E transferred to internal heat of H2O

  1. Apr 4, 2012 #1

    Use the law of conservation of energy to calculate the temperature increase expected from energy transferred to internal heat of the water.
    There is more than one way to do this. Consider a mass, m, of water which falls over the cascade. If you wish, you may take the mass of the water that you are considering to be 1.000 kg, though this is not essential. You should assume that there is no net transfer of energy between the mass of water that you are considering and the surrounding water and that all the kinetic energy of the water gained in the fall is transferred to internal energy as the water reaches the bottom of the waterfall.
    The height of the drop is 365 m.
    The question requires that q and c are unknown.

    2. Relevant equations

    q = Lv m
    q = m c ΔT
    any others that are needed?

    3. The attempt at a solution

    No idea where to start.
  2. jcsd
  3. Apr 4, 2012 #2

    In the fall to the collection point, the water will gain velocity. You can easily determine its kinetic energy when it hits the collection point in a number of ways. Since energy is conserved, the kinetic energy changes form as motion ceases. It changes from kinetic energy to heat.