Problem P. 4128. (January 2009)

P. 4128. The pressure of the water supply of a city is maintained by a 24-m high water column. What is the daily electrical energy consumption of a city which has 50 000 citizens if the average water consumption of a citizen is 100 litres per day, the efficiency of the pumps is 80%, and the efficiency of the electric motors is 92%?

What is the average electrical power input of the water plant?

(4 pont)

Deadline expired on February 11, 2009.

Statistics:

143 students sent a solution.
4 points:	115 students.
3 points:	10 students.
2 points:	2 students.
1 point:	8 students.
Unfair, not evaluated:	8 solutionss.

Problems in Physics of KöMaL, January 2009