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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February 21,2020

Sydney, Feb 21: Leg-spinner Poonam Yadav bowled a magical spell in her comeback game to steer India to a comfortable 17-run win over defending champions Australia in the opening match of the Women's T20 World Cup on Friday.

Put in to bat, India struggled to a below par 132 before Poonam (4/19 in 4 overs) foxed the Aussies with her googlies, turning the match decisively into her team's favour.

Australia, who have won the competition four times in six editions, were all out for 115 in 19.5 overs

"A bowler like Poonam is someone who leads from the front. We were expecting a great comeback from her. Our team is looking nice, earlier we depended on two-three players," India skipper Harmanpreet Kaur said after the match.

Poonam, who missed the preceding tri-series due to a hand injury, also got good support from other bowlers including pacer Shikha Pandey.

The 28-year-old from Agra was on a hat-trick but narrowly missed out as wicketkeeper Taniya Bhatia dropped a difficult chance.

The tournament-opener saw a record 13,000 plus attendance with a sizeable chunk supporting India.

India next play against Bangladesh in Perth on February 24.

"It was great for me to come back from injury and perform like this. It was the third time that I was on a hat-trick but satisfied that I was able to do the job for the team," said Poonam at the post-match presentation.

Australia were off to a good start to their chase with opener Alyssa Healy making a 35-ball 51, laced with six boundaries and a six.

However, Indian spinners led by Poonam triggered a collapse as Australia suddenly slipped to 82 for six.

Poonam (4/19) snapped four wickets, two in successive deliveries in the 12th over, to break the back of Australia's chase.

Ashleigh Gardner (34 off 36) tried her bit but didn't get any support from the other end.

Earlier, India squandered a flying start to end up with a below-par total.

Sixteen-year-old Shafali Verma took India to 40 for no loss in four overs with a typically aggressive 29 off 15 balls but her fall derailed the innings as the other batters disappointed.

Deepti Sharma made a composed 46-ball 49 in the second half of the innings but the firepower that India needed in the death overs was badly missing.

India were cruising initially with Shafali taking the opposition to the cleaners, hitting five fours and a six.

However, left-arm spinner Jess Jonassen (2/24) snapped two quick wickets, Smriti Mandhana (10 off 11) and Harmanpreet (2 off 5) to reduce India to 47 for three.

Deepti then shared 53 runs with Jemimah Rodrigues (26 off 33) to bring up the 100 in the 16th over.

For Australia, Ellyse Perry (1/15) and Delissa Kimmince (1/24) were the other wicket-takers.

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March 2,2020

Christchurch, Mar 2: India captain Virat Kohli on Monday said the under-fire Rishabh Pant has got a "lot of chances" but the team is not looking to try someone else in the youngster's place just yet as one player can't be singled out in a collective failure.

Pant has been under the scanner for the past one year because of his inconsistent run. His tally of 60 runs across four innings in the 0-2 Test series loss to New Zealand, which concluded here on Monday, has only amplified the debate whether it was prudent to leave out a keeper of Wriddhiman Saha's calibre and back Pant.

"...we have given him (Pant) a lot of chances in the home season as well starting from Australia. Then he was not playing for a bit. In turn he really worked hard on himself," Kohli came to Pant's defence after the series here.

"You need to figure out when is the right time to give someone else a chance. If you push people too early, they can lose confidence," he added.

"...collectively, we didn't perform. I don't believe in singling him out. We take the hit together as a group whether it's the batting group or as a team."

When asked if he believes Pant has taken his place in the side for granted, Kohli made it clear that the culture of this team doesn't encourage anyone to think along those lines.

"I don't see anyone taking his place for granted in this team. That's the culture we have set. People are told to take responsibilities and work hard. Whether it happens or not is a different thing. Then you can have a conversation with the players," he said.

"But no one has come here thinking I am going to play every game or I am indispensable," he added in no uncertain terms.

Kohli, just like head coach Ravi Shastri, made it clear that Pant can make a difference in overseas conditions and he won't like to deviate during future tours.

"The time that he didn't play, he really worked hard on his game. So we thought this is the right time because of his game and the way he plays because he can make a difference lower down the order.

"That was our planning behind it. We can't really fluctuate when it comes to what we planned," he added.

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June 10,2020

Kingston, Jun 10: "Enough is enough", said West Indies all-rounder Dwayne Bravo as he opened up on the raging issue of racism and called for "respect and equality" for black people, who have faced discrimination for years.

Bravo joined the likes of his former captain Darren Sammy and Chris Gayle in denouncing racism in the wake of African-American George Floyd's killing at the hands of a white police officer in the USA.

"It's sad to see what's going on around the world. As a black man, we know the history of what black people have been through. We never ask for revenge, we ask for equality and respect. That's it," Bravo told former Zimbabwe cricketer Pommie Mbangwa in an Instagram live chat on Tuesday.

"We give respect to others. Why is it that we are facing this over and over? Now enough is enough. We just want equality. We don't want revenge, war.

"We just want respect. We share love and appreciate people for who they are. That's what is most important."

The 36-year-old, who has played 40 Tests, 164 ODIs and 71 T20Is for West Indies, said he wants the world to know that they are powerful and beautiful people and gave the example of greats such as Nelson Mandela, Muhammad Ali, Michael Jordan.

"I just want our brothers and sisters to know that we are powerful and beautiful. And at the end of the day, you look at some of the greats of the world, whether it is Nelson Mandela, Muhammad Ali, Michael Jordan we have had leaders who paved the way for us," he said.

Two-time T20 World Cup-winning captain Sammy had earlier alleged that a racist nickname was used to address him during his IPL stint with Sunrisers Hyderabad and demanded an apology.

Sammy said he was called 'Kalu' while he was in India. 'Kalu' is a derogatory word to describe black people.

Gayle, who too plays in the IPL, took to Twitter to back Sammy, saying that racism does exist in cricket.

"It's never too late to fight for the right cause or what you've experienced over the years! So much more to your story, @darensammy88. Like I said, it's in the game!!," Gayle tweeted.

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