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    5/18/2009

    ZT : 恭喜杭州交警荣获2009诺贝尔物理学奖

    诺贝尔物理学奖委员会近日在瑞典斯德哥尔摩宣布:由于杭州交警在5。7撞车事件中推翻了能量守恒定律和牛三定律,将提前获得2009年物理学奖。杭州交警具体推翻此经典定律的过程如下:
      
       通过录像资料以及目击者证词可知:汽车越过斑马线50米后停止:S1=50. 受害人谭卓被撞飞5米高20米远:h=5,S2=20. 跑车刹车时轮胎与干燥水泥地面的摩擦因数为u=0.8。 跑车质量约为1600kg:M1=1600。 谭卓质量约为70kg:M2=70。 人与车碰撞时间约为0.1s即t1=0.1。 玻璃凹下0.1米,即s3=0.1。 设汽车发生形变所需能量为E1,人发生形变所需能量为E2,刹车前汽车速度为v0,碰撞前汽车速度为v1,人被撞后速度为V2, 人与车的平均作用力为F
      
       通过能量守恒可知:1/2*M1*V1*V1=u*M1*g*S1+1/2*M2*V2*V2+E1+E2
       即碰撞的汽车动能等于轮胎与地面产生的热量、人的动能、汽车与人发生形变所需能量之和。
      其中:(1)轮胎与地面产生的热量:u*M1*g*S1=0.8*1600*10*50=640000
      (2)人从最高点下落时:h=1/2*g*t*t 则t=1s。人在空中总时间为2t=2s。可解得人的水平速度Vx=S2/2t=10,竖直速度Vy=根号下2gh=10,则人被撞后速度V2=根号200 可解得人的动能为1/2*M2*V2*V2=7000
      (3)以人为对象,通过动量定理可得:F*t1=M2*v2-0 则F=9870 汽车发生形变所需能量E1=F*S3=987
      (4)人发生形变所需能量E2约等于E1=987
      把以上数据带入方程可解得v1=28.8m/s=104km/h
      根据人的本能反应:碰撞前人会刹车,则v0大于等于v1,所以汽车时速至少在100km/h以上。
      
      而交警通过大量事实证明车的时速为70码,实践是检验真理的唯一标准,可知能量守恒定律以及牛顿定律不能成立。这在物理学的发展史上具有里程碑的意义,所以杭州交警们当之无愧地获得2009年若贝尔物理学奖!

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    光平 施wrote:
    曾于杭求学而骄傲啊~~
    Aug. 4

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