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把混合在一起的物质分选开来是一项耗时耗力的事情,怎么能巧妙的把它们分开呢?动动你的脑筋,利用你所学习的物理知识,或许能想出好的方法,下面介绍几个自动分选的方法,可以借鉴.一、谷物分选器农民精选谷种时,常用一种叫“风车”的农具进行分选.在同一风力作用下,谷种和瘪谷都从洞口水平飞出,结果谷种和瘪谷落地点不同,自然分开.如图1所示.若不计空气阻力,对这一现象,下列分析正确的是().
It is a time-consuming and labor-intensive task to separate the mixed substances. How can you separate them skillfully? Move your mind and use the physical knowledge you have learned to come up with good ideas The following describes several methods of automatic sorting, you can learn from: First, the grain sorter Farmer selection of grain, commonly used a called “windmills” for sorting.Under the same wind, the grain And the deflated valley are flying out of the level of the hole, the results Valley and the deflated valley fall site naturally, as shown in Figure 1. If you do not count the air resistance, the following analysis is correct ().