一、从实验原理说起单摆在摆角小于10°时的振动才可以看作是简谐运动,此时其振动的固有周期为T=2π(1/g)~(1/2),由此可得g=4π~21/T~2。据此,只要测出摆长1和周期T,即可计算出当地的重力加速度。 First, from the experimental principle, the vibration of a single pendulum with a swing angle less than 10° can be considered as a simple harmonic motion. At this time, the natural period of its vibration is T=2π(1/g)~(1/2). This yields g=4π~21/T~2. Accordingly, as long as the swing length 1 and the period T are measured, the local gravitational acceleration can be calculated.