Problem P. 4155. (April 2009)

P. 4155. The electrical power of a vacuum cleaner is 1 kW. According to its description its airflow is 52 litre/s. The diameter of the tube is 3 cm. What percent of the total power is used to accelerate the air?

(4 pont)

Deadline expired on May 11, 2009.

Statistics:

115 students sent a solution.
4 points:	79 students.
3 points:	6 students.
2 points:	1 student.
1 point:	15 students.
0 point:	6 students.
Unfair, not evaluated:	8 solutionss.

Problems in Physics of KöMaL, April 2009