In world record, Bolt triumphed over air

July 26, 2013

Bolt_triumphedParis, Jul 26: Scientists today said Usain Bolt performed a feat of biomechanics when he ran 100m in a record 9.58sec at the 2009 World Championships in Berlin.

Crossing the line in a time that is still a world record meant Bolt had to muster "truly extraordinary" power and energy to overcome exceptional drag, they said.

Taking into account the altitude of the Berlin track, the temperature at the time of the race and the resistance caused by Bolt's 1.95m (six feet five inch), 94-kilo (207-pound) frame, the researchers calculated he had a drag coefficient of 1.2, which is less aerodynamic than the average human.

Bolt hit peak power after only 0.89 seconds, expending 81.58 kilojoules of energy by the time he finished the race.

But 92.21 percent of this energy was used to overcome air resistance, according to a paper appearing in the European Journal of Physics. Only 7.79 percent was used to achieve motion. After 41 strides, he crossed the line at 43.92 kilometres (27.29 miles) per hour.

"The enormous amount of work that Bolt developed in 2009, and the amount that was absorbed by drag, is truly extraordinary," said scientist Jorge Hernandez from the National Autonomous University of Mexcio.

"It is so hard to break records nowadays, even by hundredths of a second, as the runners must act very powerfully against a tremendous force which increases massively with each bit of additional speed they are able to develop.

"This is all because of the 'physical barrier' imposed by the conditions on Earth. Of course, if Bolt were to run on a planet with a much less dense atmosphere, he could achieve records of fantastic proportions."

The team compared Bolt's time in Berlin with his previous world-record time, of 9.69sec, set during the 2008 Beijing Olympics. In Berlin, he benefited from a tiny tailwind of 3.23 kph (2 mph), the researchers found.

Without this boost, he would have come in at 9.68sec, thus beating the previous mark by 0.01sec. The analysis was made from data provided by the International Association of Athletics Federations (IAAF), whose laser tracker recorded Bolt's position and speed every 0.1 of a second in Berlin.

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Agencies
June 23,2020

Belgrade, June 23: Novak Djokovic tested positive for the coronavirus on Tuesday after taking part in a tennis exhibition series he organized in Serbia and Croatia.

The top-ranked Serb is the fourth player to test positive for the virus after first playing in Belgrade and then again last weekend in Zadar, Croatia.

His wife also tested positive. “The moment we arrived in Belgrade we went to be tested. My result is positive, just as Jelena's, while the results of our children are negative," Djokovic said in a statement.

Djokovic has been criticized for organizing the tournament and bringing in players from other countries amid the coronavirus pandemic.

Viktor Troicki said Tuesday that he and his pregnant wife have both been diagnosed with the virus, while Grigor Dimitrov, a three-time Grand Slam semifinalist from Bulgaria, said Sunday he tested positive.

Borna Coric played Dimitrov on Saturday in Zadar and said Monday he has also tested positive. There were no social distancing measures observed at the matches in either country and Djokovic and other players were seen hugging each other and partying in night clubs and restaurants after the matches.

 “Everything we did in the past month, we did with a pure heart and sincere intentions,” Djokovic said.

“Our tournament meant to unite and share a message of solidarity and compassion throughout the region.” Djokovic, who has previously said he was against taking a vaccine for the virus even if it became mandatory to travel, was the face behind the Adria Tour, a series of exhibition events that started in the Serbian capital and then moved to Zadar.

He left Croatia after the final was canceled and was tested in Belgrade. The statement said Djokovic was showing no symptoms.

Despite the positive test, Djokovic defended the exhibition series. “It was all born with a philanthropic idea, to direct all raised funds towards people in need and it warmed my heart to see how everybody strongly responded to this,” Djokovic said.

"We organized the tournament at the moment when the virus has weakened, believing that the conditions for hosting the Tour had been met. “Unfortunately, this virus is still present, and it is a new reality that we are still learning to cope and live with.”

Djokovic said he will remain in self-isolation for 14 days and also apologized to anyone who became infected as a result of the series. Organizers of the Adria Tour said the third stage of the event, scheduled to held next week in Bosnia, has been cancelled.

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News Network
January 8,2020

Indore, Jan 8: Former opener Gautam Gambhir is mighty impressed with the way K.L. Rahul batted during India's comfortable seven-wicket win over Sri Lanka in the second T20I and said it amazes him why the right-handed batsman can't play the same way in Tests. On Tuesday, Rahul top-scored with a 32-ball 45 as India chased down the meagre target of 143 with utmost ease at the Holkar Stadium.

"Rahul is in unbelievable form. It amazes me every time I see Rahul bat that why didn't he play the same way in Test cricket," Gambhir told the host broadcasters. "It's not about only white-ball cricket; it is about Test cricket too. He just got into a shell too much. With the kind of quality he posses, he is someone who can get you a 50-ball 100 in Test cricket as well. The kind of shots he has is superb," he added.

Shikhar Dhawan, who is making a return to the team after an injury lay-off, also contributed with a "rusty" 30-ball 32. Both Dhawan and Rahul are virtually playing for the second opener's slot for the World T20, with Rohit Sharma set to be one.

And Gambhir feels going by the current form, Rahul should be opening the batting alongside Rohit in Australia. "You can't compare IPL to international cricket. When you're playing for Delhi Capitals, you know there's no one waiting for the opportunity, but when you're playing for the country and you know there's someone who's actually can replace you, there'll always be pressure. And today it was shown who's in better form," Gambhir said.

The cricketer-turned-politician, however, exuded confidence that Dhawan will bounce back strongly in the next game. "Shikhar Dhawan looked rusty but it's a good thing that he got some runs under his belt. It will help him when he walks out to bat in the next game. Had he got out early, the pressure would have been more," he said.

India will play Sri Lanka in the final T20I in Pune on Friday before taking on Australia in a three-match ODI series beginning January 14 in Mumbai.

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News Network
June 13,2020

New Delhi, Jun 13: West Indies all-rounder Dwayne Bravo has said that wicket-keeper batsman MS Dhoni is the biggest superstar in cricket and is one of the easiest guys to interact with.

Bravo was doing an Instagram live chat with former Zimbabwe pacer Pommie Mbangwa and it was then that the all-rounder was asked to talk about his stint with Chennai Super Kings (CSK).

"I think a lot of credit for CSK's success has to be given to Dhoni and Fleming, obviously the owners, they trust both Fleming and Dhoni, so there is no outside interference when it comes to decision making, both are very big students of the game, players love MS and it's an environment and franchise that allows you to be you," Bravo told Mbangwa during the chat.

"MS Dhoni is the biggest superstar in cricket and in our team. He was one of the easiest people to interact with, outside of the cricket field, he is like playing video games, his door is open at all times, whenever you talk about the biggest superstar and then you think a person like Dhoni is the most humble of them all. CSK is a special team and we have the most loyal fans," he added.

Bravo has been with the CSK since 2011. He has played a total of 104 matches for the franchise, picking up 121 wickets.

The all-rounder has also managed to win the Purple Cap (most wickets in IPL) two times (2013 and 2015).

CSK has won the IPL thrice (2010, 2011 and 2018) and all the titles have come under the leadership of MS Dhoni.

Thirty-eight-year-old Dhoni has been currently enjoying some time away from the game. He last played competitive cricket during the 2019 World Cup.

Dhoni had to face criticism for his slow batting approach during India's matches in the high-profile game.

This year, Dhoni did not find a place for himself in the BCCI's centrally contracted players list.

The board had released the list of central contract list of players for the period from October 2019 to September 2020.

Dhoni is the only captain to win all major ICC trophies (50-over World Cup, T20 World Cup, and Champions Trophy).

Under his leadership, India also managed to attain the number one ranking in Test cricket.

He would have been leading the Chennai Super Kings (CSK) if the Indian Premier League (IPL) had commenced from March 29.

However, the tournament has been postponed indefinitely due to the coronavirus pandemic.

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