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
February 19,2020

Feb 19: India captain Virat Kohli on Wednesday dropped enough hints to indicate that seniormost pacer Ishant Sharma and young opener Prithvi Shaw will be in the playing XI for the first Test against New Zealand in Wellington. If India's net session on Wednesday is taken into consideration, Wriddhiman Saha is starting as the wicketkeeper ahead of Rishabh Pant for the series opener beginning on Friday. Hanuma Vihari, the team's designated No 6 batsman for away Tests, will be the fifth bowling option with Jasprit Bumrah, Mohammed Shami and Ishant being three specialist pacers.

Ravichandran Ashwin is in the mix for the lone specialist spinner's spot though Ravindra Jadeja's all-round skills can't be ignored either.

Ishant, who was out for three weeks with an ankle injury sustained during a Ranji Trophy game, bowled full tilt at the nets and even earned appreciation for troubling batsmen with his pace and bounce.

"He (Ishant) looked pretty normal and pretty similar to what he was bowling before the ankle injury. He is hitting good areas again and he has played (Test cricket) in New Zealand couple of times, so his experience will be useful to us. It was really good to see him bowling with pace and in good areas," Kohli said during his media interaction.

The skipper also said in as many words that the team wouldn't like to change Shaw's natural stroke-play which was a good enough hint that Shubman Gill will have to warm the benches for now.

"Prithvi is a talented player and he has his own game and we want him to follow his instincts and play the way he does. Look, these guys have no baggage and are not desperate to perform in any manner," the skipper said.

The skipper wants Shaw to take a leaf out of Mayank Agarwal's performance in Australia back in 2018-19 when he hit back to back half-centuries in Melbourne and Sydney.

"They don't have any nerves to do well overseas. Like a clear head with which Mayank played in Australia, Prithvi can do the same in New Zealand.

"A bunch of guys playing with fearlessness, something that can motivate the whole team, gives us start that the team wants and not get intimidated by the opposition in any way."

The skipper downplayed India's below-par show in the three-match ODI series, especially that of Agarwal.

"Prithvi, I think you can call him relatively inexperienced and Mayank, I wouldn't call him that inexperienced because he has scored a lot of runs last year. So he understands what his game is like in Test cricket.

"I think sometimes in white ball cricket we try to do too much but once you come into red ball cricket, you fall into that disciplined mode of batting, which obviously suits him much more at this stage."

While he didn't give an answer on the Saha-Pant debate, the burly Delhi keeper had precious little to do at the main nets and was seen spending more time doing his keeping drills and only got an opportunity to bat when the first team completed its routines.

New Zealand are likely to go with an all-pace attack but the Indian captain wants to stick to his team's strengths which is play with one spinner in the four-pronged bowling attack.

"If it had been a Johannesburg pitch, I could have said it's a possibility (to play four pacers) but our team has that skill that we can bowl out other teams with only three fast bowlers," he sounded confident.

"But you need one world class skillful spinner, who can take wickets on any pitch. We won't copy the home team. We would rather figure out what is the most lethal combination, which gives us balance," he added.

"As a bowling group it's better than the one that came to NZ last time and that is why we have got so many teams all out in last two and half years. We would like to repeat that here also," Kohli added.

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Agencies
August 4,2020

New Delhi, Aug 4: Former India women's team captain Anjum Chopra firmly believes that the BCCI has a plan for women's cricket but she wants the Board to communicate its ideas more specifically.

Speaking to news agency, Chopra, who is now a successful broadcaster, said the BCCI is thinking in earnest about the progress of women's cricket.

"It's not that the BCCI is not thinking about women's cricket. I only think they need to be more specific in communication about women's cricket," Chopra said.

"I firmly believe that they must be thinking about women's cricket but the communication all this while has been very specific to men's cricket."

The latest trigger for criticism of BCCI was India's withdrawal from a tour of England in September owing to logistical issues arising out of the COVID-19 pandemic.

Chopra concedes it was "not nice" but Indian players' participation in the women's IPL, in November, will still be useful preparation for next year's ODI World Cup.

"It is heartening to see women's cricket making headlines. They should have been a part of that England tour and it did not feel nice initially but the women's IPL, irrespective of the format, will be helpful for World Cup preparations. Any form of cricket is good preparation," Chopra said.

"Missing out on a tournament is not nice, but logistically there may have been issues. And you can't send an under-prepared team."

"If you see in isolation we may have missed out on an opportunity to play in England. The more the girls play the better it is, before playing a tournament of the stature of World Cup. The assurance from the president is a very good thing."

Chopra welcomed the Sourav Ganguly-led BCCI's decision to hold the women's event in the UAE alongside the IPL, which will run from September 19 to November 10. The women's IPL will coincide with the business end of the men's league.

"I am definitely happy, it's always nice to be part of any cricket anywhere across the world.

"They should have been nearing the final stages of the preparation for the World Cup by now, but because of the pandemic things did not go as planned," she added.

Chopra had a successful international career spanning over 17 years, during which she represented India in a record six World Cups and became the first woman cricketer to appear in 100 One-day Internationals.

She also felt that the pandemic would not have much impact on the women's game that has gained momentum in recent times.

"...Cricket was on pause button...Once cricket resumes and players are back on the park, everything is going to get picked up. It might take some time to get started as everything starts from zero...

"The awareness the women's game has created, I hope it stays. They will just restart, not start after the pandemic."

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News Network
April 27,2020

Mumbai, Apr 27: The pressure to replace iconic Mahendra Singh Dhoni behind the stumps was "immense" due to high expectations from fans says K L Rahul, who has been doing the wicket-keeping duty for India in the limited overs format for some time now.

Dhoni quit Test cricket in 2014 and has not played for India in the limited overs format since last year's ODI World Cup in England.

Rahul kept the wickets in the limited overs series against Australia in January this year and also during the team's tour to New Zealand.

"I was nervous when I was doing it for India because of the crowd pressure. If you fumble, people feel that you cannot replace MS Dhoni. The pressure of replacing a legendary wicket-keeper like MSD was immense as it involved people accepting someone else behind the stumps," Rahul told Star Sports on its show 'Cricket Connected'.

Rahul, who has played 32 ODIs and 42 T20Is, said keeping the wickets is not alien to him since he dons the gloves during the Indian Premier League (IPL) and also when he plays for his Ranji side Karnataka.

"People who follow cricket know that I haven't been away from wicket-keeping for too long as I donned the gloves in the IPL and every time I played for Karnataka," the 28-year-old said.

"I am always in touch with wicket-keeping but am also somebody who is more than willing to take up the role if the team needs me to," he stressed.

Dhoni's career is a matter of intense speculation. Many former players feel that it won't be easy for Dhoni to make it to the national squad for the upcoming T20 World Cup, scheduled to be held in Australia. 

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