It's like a pendulum which has a length of 115 meters.
就像一个钟摆，长度115米。
The swing is a pendulum with a single natural frequency depending on its length.
秋千是只有一个固有频率的摆，此频率决定于它的长度。
Using the single pendulum, we can research the relationship between the period of oscillation of it and the length of it and measure local acceleration of gravity.
通过单摆装置可以方便地研究单摆的振动周期与摆长关系和测定当地的重力加速度。
So in experiment we should measure the length of single pendulum, then get the period of oscillation in this condition.
在实验中就要测定单摆的摆长，然后测定此摆长时的振动周期。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
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