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,
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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 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 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,(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
接楼上的解答。受力平衡有两种运动状态,一种是静止,一种就是匀速运动。现在人相对于飞机是静止的,相对于地球是匀速运动,所以是受力平衡。如果受力不平衡,就会有加速度,绝对不会静止。人现在受到重力mg,这是肯定的。所以就会有另外一个力(因为受力平衡),与重力等大反向。可是net force不是指的合外力吗,如果有一个力于重力等大反向,那么net force不是应该等于0吗?如果是合力,那么合力为零。...
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接楼上的解答。受力平衡有两种运动状态,一种是静止,一种就是匀速运动。现在人相对于飞机是静止的,相对于地球是匀速运动,所以是受力平衡。如果受力不平衡,就会有加速度,绝对不会静止。人现在受到重力mg,这是肯定的。所以就会有另外一个力(因为受力平衡),与重力等大反向。
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