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你注意到了吗?物理学习中要用到许多数学知识,请看下面一些例题.例1现有一不等臂天平,物体放在左盘称,质量为0.4kg,放在右盘称,得质量为0.9kg,那么该物体的真实质量为多少?
Have you noticed? There are many mathematical knowledge to be used in physics study. Please see some examples below. Example 1 There is an existing unbalanced arm balance. The object is placed on the left disk and the mass is 0.4kg. For 0.9kg, what is the true mass of the object?