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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January 13,2020

Mumbai, Jan 13: India captain Virat Kohli indicated at dropping himself down the batting order to accommodate both Shikhar Dhawan and KL Rahul in the playing XI against Australia in the first ODI of the three-match series starting Tuesday.

With vice-captain Rohit Sharma an automatic pick, the team management is left with tough choice of selecting either Dhawan or Rahul in the XI. But the skipper sees no reason why both can't play together.

"Look, a guy in form is always good for the team. ...You obviously want to have the best players available and then chose from what the combination should be for the team. There might be a possibility that all three (Rohit, Shikhar and Rahul) might play. It will be interesting to see what balance we want to take in on the field," Kohli said on the eve of the match.

Asked if he would he be happy to bat lower down the order, Virat said,"Yeah, big possibility. I would be very happy to do so. Look I am not possessive about where I play. I am not insecure about where I bat," said the skipper.

For Kohli, it is more important as to what kind of leadership legacy he leaves behind rather than chase personal glory.

"Being the captain of the team, it is my job to make sure that the next lot is also ready. A lot of the other people might not look at it that way, but your job as a captain is not only to look after the team right now, but also to prepare a team that you leave behind when you eventually pass it onto someone else," he added.

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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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June 29,2020

Jun 29: The West Indies cricketers will sport a 'Black Lives Matter' logo on the collars of their shirts during the upcoming three-Test series against England to protest against racism in sports.

Skipper Jason Holder, who has voiced his support to the cause that has once again come to the forefront after the killing of American George Floyd, said in a statement on Sunday: "We believe we have a duty to show solidarity and also to help raise awareness."

The ICC-approved logo, designed by Alisha Hosannah, will be the one which featured in the shirts of all 20 Premier League football clubs since the sport's resumption earlier this month.

"This is a pivotal moment in history for sports, for the game of cricket and for the West Indies cricket team," Holder was quoted as saying by ESPNcricinfo.

"We have come to England to retain the Wisden Trophy but we are very conscious of happenings around the world and the fight for justice and equality. "As a group of young men, we know of the rich and diverse history of West Indies cricket and we know we are guardians of the great game for a generation to come."

Holder, who wants racism to be treated at par with doping and corruption, said they arrived at the decision to wear the logo after much thought.

"We did not take our decision lightly. We know what it is for people to make judgments because of the colour of our skin, so we know what it feels like, this goes beyond the boundary. There must be equality and there must be unity. Until we get that as people, we cannot stop," he said.

"We have to find some way to have equal rights and people must not be viewed differently because of the colour of their skin or ethnic background."

The West Indies players are likely to wear the shirts for the first time in this week's four-day warm-up match at Emirates Old Trafford, starting on Monday.

The opening Test of the series, which will mark the resumption of international cricket after the coronavirus-forced hiatus, will get underway at the Ageas Bowl in Southampton on July 8.

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