Studies application of matric method to deal with fixed point rotation of rigid body, and infers instantaneous axis equation.
介绍了用矩阵讨论刚体定点转动瞬轴的方法，在此基础上推导出转动瞬轴方程。
From the Angle of relative equilibrium, the paper analysis the reason of the formation of the additional pressure on the axis of fixed-point rotation of rigid body.
从相对平衡的角度分析了刚体定轴转动轴上附加压力产生的原因以及实现自由转动的条件。
Computation of the magnetic field, which is produced by a charged body rotating about a fixed axis, is a classical question about magnetostatic boundary-value problem.
求定轴匀角速转动带电体的磁场是一类典型的静磁场边值问题。
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