一般物理问题的求解,是根据物理定律、公式建立方程,从而解出所求量的数值,但也常有一些物理问题需要求解的不是某个物理量的具体值,而是要确定取值范围.解决这类问题的关键在于对所给问题做物理过程分析,建立一些不等式关系,那么解算取值范围需用的不等式关系应如何建立呢?下面仅就几个实例加以说明. Solve the general physical problem is to establish the equation according to the laws of physics, formula, so as to solve the value of the quantity sought, but there are often some physical problems that need to be solved is not a specific value of a physical quantity, but to determine the range of values. The key to this kind of problem lies in the physical process analysis of the given problem and the establishment of some inequality relations. Then how to establish the inequality relations needed to solve the range of values? Here are just a few examples to illustrate.