Special Report, Americas, US

[NetflixlAnags]

Recently-paved tracks are a good place to find slickness resulting from friction-heated asphalt. As the asphalt binder is worn away, the aggregate still remains. This exposed aggregate accounts for the other physical change NASCAR tracks -- both concrete and asphalt -- undergo during a race. Because of the heat from the friction between the tire and the track surface, racing tires become malleable. As a result, the aggregate can quickly wear tires down, tearing off small pieces of the rubber that stick to the track. The type and age of the aggregate has an effect on how much rubber a track claims. The track at South Carolina's Darlington Raceway used seashells as an aggregate. It's traditionally been known for chewing tires up. With 43 cars running on any given track, that can add up to a lot of claimed rubber. That means drivers go through more tires, but since rubber provides excellent traction, it ultimately means a benefit for the drivers. The rubber doesn't stick around forever, though. After a heavy rain, it's washed away, leaving the track green, yet another change NASCAR tracks undergo. Not to worry; after a few laps the track will get rubbered up again, opening the gate for high-speed racing. Borden, Bill. "Goodyear touts 'a lot of communications' between engineers, NASCAR, teams." ESPN. Borden, Bill. "Tire management holds race results in the balance." ESPN. Borden, Bill. "Trying to control racing's friend, foe." ESPN. Davis, John. "Asphalt for race tracks." Asphalt Institute. Johnson, Andy. "Tire and asphalt melting." Argonne National Laboratories. Leslie-Pelecky, Diandra. "Why do asphalt tracks change during a race?" Stock Car Science. Price, Jeffrey. "Intermediate track analysis." KFFL.|Russia on Tuesday launched new military exercises near Ukraine. In annexed Crimea as it accused the U.S.S. The drills involve combat firing exercises with fighter jets, bombers, anti-aircraft systems and ships from the Black Sea and Caspian fleets, the ministry said. The West is accusing Russia of preparing a potential invasion of pro-Western Ukraine. Tensions with Moscow have reached levels not seen since the Cold War. After a long video call with European leaders on Monday, U.S. President Joe Biden said there was “total unanimity” on how to deal with Russia, with officials warning again of severe consequences if Moscow invades. The Pentagon said it had put 8,500 troops on standby for deployment in support of NATO, while the alliance said it was sending ships and jets to bolster eastern Europe’s defences. Russian President Vladimir Putin’s spokesman Dmitry Peskov said U.S. “The United States is escalating tensions,” he told reporters.




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