如下图所示,倾角为θ的光滑斜面上有一固定点O,将细绳的一端固定

如下图所示,倾角为θ的光滑斜面上有一固定点O,将细绳的一端固定在O点上,另一端系一个小球,小球球心到O点距离距离为L.当小球在平衡位置附近的斜面上摆动时,摆角α控制在5°范围内,则此摆的振动周期T=             .

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