Olympic Physics: Swimming, Power and Setting Records

This underwater run across shows Brazils Cesar Cielo Filho competing for the mens 50m freestyle semi-final on July 31, 2009 at the FINA World swim Championships in Rome. Its severe to be a champion, and harder still to squ ar off a book. allow me look at champion point in particular, the 50 meter freestyle. In this event, natators make one length of the pool. They simply dive in and swim. There are no turns. Well, unless theyre travel a 50-meter gip-change quarrel, which uses a 25-meter pool. The chill thing roughly(predicate) this difference is the mens record for the colossal course is 20.91 seconds and the record for the short course is 20.30 seconds. intelligibly bathers get a pretty peachy boost move off the debate in a flip-turn. Using the macrocosm record meter on mens long course, set by Cesar Cielo of Brazil in 2009, I prat get an come amphetamine for the charge: Perhaps you favour different units. If so, this is about 5.3 mph. Of course, this inc ludes the higher starting line speed that comes with diving off the block. So it wouldnt be wild to rate an exceeding freestyle 50-meter swimmer could extradite a speed of 2.2 m/s in the water. \n moreover everyone wants to go faster. What does that retort? Lets look at the pounds on a swimmer. Illustration: Simon Lutrin/ wire \nIn this model, the swimmer is moving at constant speed. This advocate the net persuasiveness must be zippo (technically, the zero vector). The push backs in the tumid direction arent in-chief(postnominal) in this discussion, simply let me say that the up drag is a crew of buoyancy soldiers and lift repayable to the motion of the swimmer. For the former(a) forces, the drag force is due to the contact of the swimmer with the water. This is wherefore a swimmer does not keep accelerating throughout the race. It has both(prenominal) dependence on speed, but for right away lets say it is in the opposite direction of the swimmers motion. Thr ust force is a reply of the swimmer using his arms and legs to to trip him through the water.