Question

The temperature at the bottom of a high water fall is higher than that at the top because

• A. by itself heat flows from higher to lower temperature
• B. the difference in height causes a difference in pressure
• C. thermal energy is transformed into mechanical energy
• D. mechanical energy is transformed into thermal energy

Answer 1

Answer: (D)

mechanical energy is transformed into thermal energy

The water at the top of the waterfall, falls and gains velocity.
The potential energy it has converts into kinetic energy.
When the water lands at the bottom, the kinetic energy converts into heat and hence the water is warmer at the bottom.