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初中物理各类考试中,牵涉到的浮力考点是非常多的,并且难度系数也相对较大,其实,我们找准切入点,搞清楚容易混淆的概念,紧扣阿基米德原理,这样,问题就不难解了.例1有一个质量是79 g的铁块,其中密度为7.9 g/cm3,求它的质量和重量?如果把它浸没在水里面,试问能排出多少水?并求它所受浮力?解析:本道试题最后需要求出铁块所受到的浮力大小,而题干中给出的已知量是非常少的,所求的量却是非常多的,问题层层相接,环环相扣.需要按部就班的解决问题.仔细分析,问
In all kinds of junior high school physics examinations, the buoyancy test points involved are very large, and the difficulty coefficient is also relatively large. In fact, we identify the entry point, find out the concept of easy confusion, closely follow the principle of Archimedes, The problem is not hard to find Example 1 There is a mass of 79 g of iron with a density of 7.9 g / cm3, asking for its mass and weight? If it is immersed in water, how much water can be discharged? It is subject to buoyancy? Analysis: The road test final need to find the size of the buoyancy received by the iron, and given the known amount of dry is very small, the amount sought is very much, the problem phase Then, interlocking. Need to step by step to solve the problem. Careful analysis, asked