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有一道判断题,30牛重的水能浮起100牛重的物体.阅卷后发现我教的3个班学生154人,全都在括号( )内打“×”.为什么学生全都错判呢?他们认为,物体受到的浮力等于它自身的重力,100牛重的物体受到的浮力应该是100
There is a question of judgment: 30 lbs. of water can float 100 lbs of heavy objects. After reading the papers, I found 154 students in the three classes I taught. All of them played in the parentheses (). Why are all students misjudged? What do they think is that the buoyancy of an object is equal to its own weight, and the buoyancy of an object weighing 100 lbs should be 100