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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News Network
July 24,2020

Bengaluru, Jul 24: Bangladesh all-rounder Shakib Al Hasan, who was earlier banned by the International Cricket Council (ICC) for breaching the Anti-Corruption Code, on Friday, said that people are bound to make mistakes and the important thing is that how well they make a comeback.

Shakib was banned from all forms of cricket on October 29 last year after he accepted the charges of breaching the ICC's Anti-Corruption Code. He will be able to resume international cricket from October 29, 2020.

"You have to be honest. You just can't lie to the people and pretend different things. Whatever happened has happened. People are bound to make mistakes. You are not 100%. The important thing is how well you can comeback from those mistakes. You can tell other people not to make those mistakes. Tell them the path so that they never take those paths," Shakib told Deep Dasgupta in a videocast hosted by ESPNcricinfo.

The 33-year-old all-rounder said he has seen many controversies ever since he was first made captain in 2009. He had trouble with the board chief, selectors and the media, mainly about selectorial decisions and not being made permanent captain between 2009 and 2010.
He believes those experiences have changed him as a person over time.

"I think [it's] combination of both [controversy following him, and vice versa]. I got the responsibility so early in my career, I was bound to make mistakes. I was captain when I was 21. I made a lot of mistakes, and there are so many things that people think about me. Now I realise that it was my fault in some areas, and in some I was misunderstood. But I get it completely. It is part and parcel in the subcontinent," Hasan said.

"Of course I will try to minimise [my mistakes] as much as I can, but by the time I got married, and now I have two kids, I understand the game and life better. It has made me a calmer person than I was in my twenties. I have changed quite a lot. People won't see me doing a lot of mistakes now. My two daughters changed my life completely," he added.

Shakib is likely return to international cricket during Bangladesh's proposed Test series against Sri Lanka in October. 

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News Network
March 28,2020

Milan, Mar 28: Juventus star Paulo Dybala revealed how he "struggled to breathe" after contracting coronavirus which has killed over 9,000 people in Italy.

The Argentine international announced last Saturday he was one of three Juventus players to catch the virus along with Daniele Rugani and Blaise Matuidi, who both had no symptoms.

"I feel better now after some strong symptoms," the 26-year-old Dybala told JTV channel.

"A couple of days ago I was not well, I felt heavy and after five minutes of movement I had to stop because I was struggling to breathe.

"Now I can move and walk to start trying to train, because when I tried in the past few days I started to shake too much.

"I gasped for air and as a result I couldn't do anything, after five minutes I was already very tired, I felt the body heavy and my muscles hurt.

"Now I'm fine. My fiancee Oriana (Sabatini) has also overcome the symptoms."

Dybala has scored 13 goals in all competitions this season, including in league leader's Juventus's last game against Inter Milan before Serie A and all sport in Italy was suspended.

"The goal against Inter was the greatest emotion, (Aaron) Ramsey provided the perfect assist - it's a pity that there was no public," added Dybala.

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Agencies
January 16,2020

Rajkot, Jan 16: Skipper Virat Kohli is set to be back at his regular number three position after the strategy of coming two-down boomeranged in the lung-opener as India take on a resolute Australia in the must-win second ODI here on Friday.

India go into the game 0-1 down after Australia registered a 10-wicket win in the lung-opener at Mumbai, courtesy David Warner and Aaron Finch, who hit unbeaten hundreds.

In a bid to field all three in-form players -- Rohit Sharma, Shikhar Dhawan and KL Rahul --, Kohli dropped himself down the order but the plan backfired spectacularly as he was unable to convert his start.

Opener Dhawan later said he was ready to bat at number three if asked to by the team management, but since Kohli has been successful at that position, the skipper would be more than willing to walk in one-down.

Kohli batting at three also provides stability to the middle-order.

With a concussed Rishabh Pant out of the second game, Rahul is a certainty as he will keep wickets.

So, like in the last game, Rohit and Dhawan, who made a dogged 74 off 91 balls in Wankhede, could open, and there could be a toss-up between Rahul and young Shreyas Iyer at number four. Iyer had a rare failure on Tuesday.

Pant's absence could pave the way for the inclusion of Karnataka batsman Manish Pandey, who made optimum use of the opportunity that he got in the third T20 against Sri Lanka in Pune.

It would also be interesting to see which among the experienced Kedar Jadhav and rookie Shivam Dube makes the squad.

Rohit, who had a phenomenal 2019, failed in the first game, but given the form he is in, the opener is expected to bounce back strongly here.

Ditto for Kohli, who is just one hundred short of equalling cricket icon Sachin Tendulkar's record of most hundreds on home soil for India.

The bowlers led by Jasprit Bumrah had a forgettable outing at the Wankhede and they would be more than eager to make a strong comeback and prove their mettle.

Bumrah, since his comeback, has not been as effective as earlier and he would like to change the perception.

It would be interesting to see whether India play Delhi speedster Navdeep Saini or persist with Shardul Thakur, who gave away 43 runs in Mumbai.

Ravindra Jadeja looks a certainty and so the choice would be between chinaman Kuldeep Yadav, who conceded 55 runs in the first ODI and Yuzvendra Chahal as the lead spinner.

On the other hand, a high on confidence Australia will be looking to seal the issue to register back to back series wins in India, a rare feat for any visiting team. The Finch-Warner combination will look forward to carry the momentum.

Their middle-order comprising the experienced Steve Smith, in-form Marnus Labuschange, Ashton Turner and Alex Carey looks more or less settled.

If all of them fire in unison, along with the openers, then it will hard for the opposition bowlers.

However, it will be quite a test of their middle-order at the Saurashtra Cricket Association stadium.

Australian bowlers also showed at the Wankhede, why they are considered among the best.

Led by pace spearhead Mitchell Starc, they bundled out India for a sub-par 255 and Mitchell Starc and Pat Cummins would be raring to go once again.

Spinners Adam Zampa and Ashton Agar, not only contained the runs, but provided crucial breakthroughs and are expected to play a similar role again in the middle overs.

The track here is expected to be a belter and India can draw confidence from the home series against New Zealand in 2017, when they won 2-1 after losing the opener, co-incidentally in Mumbai.

Squads:

India: Virat Kohli (Captain), Rohit Sharma, Shikhar Dhawan, K L Rahul (wicketkeeper), Shreyas Iyer, Manish Pandey, Kedar Jadhav, Shivam Dube, Ravindra Jadeja, Yuzvendra Chahal, Kuldeep Yadav, Navdeep Saini, Jasprit Bumrah, Shardul Thakur and Mohammed Shami.

Australia: Aaron Finch (Captain), Alex Carey (Wicket-keeper), Patrick Cummins, Sean Abbott, Ashton Agar, Peter Handscomb, Josh Hazlewood, Marnus Labuschange, Kane Richardson, Steve Smith, Mitchell Starc, Ashton Turner, David Warner and Adam Zampa.

Match starts at 1.30.

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