设绳子拉力为F,竖直方向:Fcosθ=mg,则F=mg/cosθ水平方向:Fsinθ=m*4π^2*Lsinθ/T^2,则T^2=4π^2*m*L/F=4π^2*Lcosθ/g,周期T=2πsqrt(Lcosθ/g)【俊狼猎英】团队为您解答
Fn=tanθ= m*4π^2*Lsinθ/T^2 T=2π√(Lcosθ/g)