Fans at the Tour de France can be exceedingly annoying, often impeding the cyclists and sometimes causing wrecks. In1994 Laurent Jalabert crashed into a gendarme (policeman) and was seriously hurt. Sometimes riders can stop to avoid a collision, sometimes not. It depends on friction and reaction time. The 95-kg Jalabert was speeding at 40 mph along the level street on a wet day. The coefficient of kinetic friction between his wheels and the road was 0.13. He looked up to see the gendarme about 44 m (about half of a football field) ahead of him. If he has typical human reaction time (0.15 s), how close will he be to the gendarme when he begins to apply the brakes? Round the final answer to two decimal places. As Jalabert skids, what is the magnitude of his acceleration? Round the final answer to two decimal places. How fast was Jalabert going when he hit the gendarme? Round the final answer to one decimal place.
Fans at the Tour de France can be exceedingly annoying, often impeding the cyclists and sometimes causing wrecks. In1994 Laurent Jalabert crashed into a gendarme (policeman) and was seriously hurt.
Sometimes riders can stop to avoid a collision, sometimes not. It depends on friction and reaction time. The 95-kg Jalabert was speeding at 40 mph along the level street on a wet day. The coefficient of kinetic friction between his wheels and the road was 0.13. He looked up to see the gendarme about 44 m (about half of a football field) ahead of him.
If he has typical human reaction time (0.15 s), how close will he be to the gendarme when he begins to apply the brakes? Round the final answer to two decimal places.
As Jalabert skids, what is the magnitude of his acceleration? Round the final answer to two decimal places.
How fast was Jalabert going when he hit the gendarme? Round the final answer to one decimal place.
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