Wednesday, January 23, 2019

Scientists reveal the reality of the terrible bolt speed

Scientists say they can explain the secret behind the extraordinary speed of Jamaican sprinter Usain Bolt through a mathematical model.
Bolt scored a new record in the 100m race in 9.58 seconds during the Berlin World Championships in 2009, still the current record.
Scientists say their model explains the power and energy Bolt used to overcome the drag power caused by air resistance.
The research team, which published the results in the European Journal of Physics, said it hoped to find out what makes exceptional athletes achieve such a high speed.
According to this computational model, the time taken by Bolt, 9.58 seconds in Berlin, is achieved by reaching a speed of 12.2 meters per second, equivalent to about 27 miles per hour.
Less dynamic
The scientists said that according to their calculations, the maximum speed Bolt achieved after the start of the race in less than a second, and was only in the middle of the top speed.
This shows the almost instantaneous effect of the drag force, which occurs when air resistance slows moving objects.
The researchers also found that less than eight percent of the energy produced by the muscles was used for movement, and the rest of the energy absorbed by the clouds.
When comparing the body mass of the polt, its height from the racetrack, and air temperature, the researchers found that its drag coefficient, a measure of the drag force per unit of mass, was less aerodynamic than any normal man.
Effects of drag force
"The cloud coefficient highlights the outstanding ability of Bolt's enemy," said George Hernandez of the National Autonomous University of Mexico. "He was able to break many records even though he does not have the aerodynamic dynamics that any human being can have."
"The sheer volume of work done by Bolt in 2009, in addition to the amount of energy absorbed by the drag force, is really unusual."
"It's very hard to break records today, even in hundreds of parts of a second," he said. "Competitors must work very hard against a huge force that increases dramatically in every part of the extra speed they can achieve."
"All of this is due to the physical barrier imposed by the conditions on the planet, and of course if Bolt has to surface on another planet with a less dense atmosphere, it could achieve record numbers of astonishing proportions."
"The careful recording of Bolt's speed and speed during the race gave us a great opportunity to study the effects of the power of clouds on the runner," said Hernandez.
"If more data is available in the future, it will be interesting to see what distinguishes one player from the other."
The time spent by Bolt in Berlin is the highest recorded since the introduction of electronic time in 1968.
A long step
John Burrow at Cambridge University, who previously analyzed the way Bolt could become faster, said Bolt's speed was in part because of "the length of his extraordinary pace."
"He has a lot of fast-expanding muscle fibers, which can react quickly, in addition to the rapid pace that such an exceptionally fast time gives him."
Barrow said Bolt had plenty of room to break his record if his response was faster at the start, and if he ran slightly stronger and at a higher altitude where the draw was lower.
Bolt won the record with a wind of 0.9 per second, which did not give him a chance to take advantage of the "wind-relief utility."

0 komentar:

Post a Comment