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隐含条件是物理习题中的一种常见形式,而定值隐含又是隐含条件中最多的情况.解这类习题时若找不出这些隐含的定值,就无法解出这些习题,因此寻找隐含的定值是解决这类习题的关键.下面举几例说明.一、隐含体积为定值例1:某铜制机件的质量为0.445千克,如改用铝制品质量可减少多少?(已知ρ_铜=8.9×10~3千克/米~3,p_铝=2.7×10~3千克/米~3)分析:因为制的是同一种机件,所以两种情况下机件的体积应相等.
Implicit conditions are a common form of physical exercises. Implicit in fixed values is the most common condition in implied conditions. If these implicit exercises cannot be found when solving such exercises, they cannot be solved. Therefore, finding the hidden value is the key to solve this type of exercise. Here are some examples. First, the hidden volume is a fixed value. Example 1: The quality of a copper part is 0.445 kg. If the quality of aluminum products is changed, How much can be reduced?(known ρ_copper=8.9×10~3kg/m~3, p_aluminum=2.7×10~3kg/m~3) Analysis: Because the system is the same kind of machine, so the two In this case, the volume of the parts should be equal.