一个汽车以30m/s速度在拱形桥上行驶,为保证汽车安全,拱形桥最小半径为多少?
一个汽车以30m/s速度在拱形桥上行驶,为保证汽车安全,拱形桥最小半径为多少?
如果汽车速度v>√gR，则汽车与桥无作用力，所以v30
g=10，所以10R>900，所以R>90,即半径最小为90米。
如果汽车速度v>√gR，则汽车与桥无作用力，所以v30
g=10，所以10R>900，所以R>90,即半径最小为90米。
物理人气：829 ℃时间：2019-11-08 11:46:09
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对滴!第一个是大于等于!>=!
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