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A plane is flying in a straight line,climbing steadily at a

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A plane is flying in a straight line,climbing steadily at a speed of 6m/s through still air.The net force acting on a passenger on mass M in the plane is?
先给出答案,再详细说明为什么,
A plane is flying in a straight line,climbing steadily at a
A plane is flying in a straight line,(飞机沿直线飞行) climbing steadily at a speed of 6m/s (以6米每秒的速度在静止的空气中爬升)through still air. The net force acting on a passenger on mass M in the plane is?(质量为M的乘客在飞机里受到的支持力是?)
注意,文中有steadily即任何时刻看成平衡状态,所以对人只有二力平衡,所以答案为Mg
再问: 对人哪二力平衡?人不是静止吗,怎么还受到Mg呢?
再答: net force 是指合外力的话,答案就是0咯