The period, which is 2 pi times the square root of l over g, if you substitute in your length of 5.1 meters, you will find 4.57 seconds.
周期，等于2π,乘以l/g的平方根，如果把长度为5。1米,代入，会得到4。57秒。
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The heart of Cosworth's Pi Garda is a black box that logs data from sensors inside it, such as accelerometers to measure g-forces and a satellite positioning system to determine position and speed.