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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 points)

Deadline expired on 11 May 2009.

Statistics on problem P. 4155.
 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 solutions.

• Problems in Physics of KöMaL, April 2009

•  Támogatóink: Morgan Stanley