The work of water is carried out due to a decrease in its kinetic energy to zero. The kinetic energy of water at the base of the dam is equal to its potential energy at the top of the dam. A mass of water m = 150 kg / s passes through the dam in its upper part per second. Its potential energy is mgh. This is the power of the stream R.
p = mgh = 150 kg / s • 10 m / s2 * 30 m = 45,000 W = 45 kW.
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