英语翻译Let us consider a rigid body that can rotate about a fixed vertical axis ( Fig.3.3 ).We shall confine the axis in bearing to prevent its displacements in space.The flange resting on the lower bearing prevents motion of the axis in a verti

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英语翻译Letusconsiderarigidbodythatcanrotateaboutafixedverticalaxis(Fig.3.3).Weshallconfinetheaxisinbear

英语翻译Let us consider a rigid body that can rotate about a fixed vertical axis ( Fig.3.3 ).We shall confine the axis in bearing to prevent its displacements in space.The flange resting on the lower bearing prevents motion of the axis in a verti
英语翻译
Let us consider a rigid body that can rotate about a fixed vertical axis ( Fig.3.3 ).We shall confine the axis in bearing to prevent its displacements in space.The flange resting on the lower bearing prevents motion of the axis in a vertical direction.
A perfectly rigid body can be considered as a system of particle (point particles ) with constant distances between them.Equation (a ) ,i.e.
（a）
holds for any system of particles,including a rigid body.In the latter case,is the angular momentum of the body.The right-hand side of Eq.(a) is the sum of the moments of the external forces acting on the body.
Let us take point 0 on the axis of rotation and characterize the position of the particle forming the body with the aid of position vectors drawn from this point (Fig.3.3 depicts the particle of mass ).The angular momentum of the particle relative to point 0 is
(3.7)

英语翻译Let us consider a rigid body that can rotate about a fixed vertical axis ( Fig.3.3 ).We shall confine the axis in bearing to prevent its displacements in space.The flange resting on the lower bearing prevents motion of the axis in a verti
让我们来看一个刚体旋转,可以在一个固定的垂直轴(Fig.3.3).我们将限制轴的轴承,以防止其位移的空间.法兰靠在降低轴承轴的运动的防止一个垂直的方向.
一个完美的刚体可以被视为一个系统的粒子(点粒子)不变的前提下,他们之间的距离.方程(a),如下.
(a)
适用于任何系统的粒子(包括刚体.在后一种情况下,是身体的角动量.右边的情绪智商.(a)之和的时刻外力作用于身体.
让我们花点0轴的旋转和确定粒子位置形成身体与援助的位置矢量来自这一点(Fig.3.3描绘了微粒的质量).角动量点粒子相对于0

我们来考虑一下：一个可以转动一个固定纵轴( Fig.3.3 )的刚体。我们要限制轴的轴承,以防它移位。法兰要在下轴承以防轴在垂直方向运动。
完美的刚体可以被看做是有规律的有恒定距离的两个质点。
公式(a )适用于任何粒子的体系，包括一个刚体。后面的例子是刚体的角动量。公式(a )的右边是此刻作用在刚体上的外力的总量。
我们在旋转轴上代进0，用从这个点上（Fig.3.30）得...

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