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巧妙运用极限思维法求解杠杆平衡问题,可以使问题化繁为简,化难为易,下面举例说明.例1如图1所示,一把均匀的轻质直尺可绕O点自由转动,直尺上有三只垂直而立的蜡烛A、B、C,它们的粗细、材料及燃烧速度均相同,但它们的长度关系LCLA=LB,此时,直尺处于平衡状态.那么在蜡烛燃烧的过
Clever use of the limit-thinking method to solve the problem of lever balance can simplify the problem and simplify the problem. Here is an example to illustrate. Example 1 As shown in Figure 1, a uniform lightweight ruler can be rotated freely around O point. There are three vertical candlesticks A, B, and C on the ruler. Their thickness, material, and burning speed are the same, but their length is LCLA=LB. At this time, the ruler is in equilibrium. Then the candle burns.