(1)
r=Lsin60°=3^1/2 m
(2)
Tcos60°=mg,所以:T=2mg=40 N
(3)
tan60°=F向/mg,所以:F向=mgtan60°=20*3^1/2 N
(4)
F向=mv^2/r,所以:v=(F向*r/m)^1/2=30^1/2 m/s
(5)
ω=v/r=(30^1/2)/(3^1/2)=10^1/2 rad/s
(6)
T=2π/ω=2π/(10^1/2)=(10^1/2)π/5 s
(1)
r=Lsin60°=3^1/2 m
(2)
Tcos60°=mg,所以:T=2mg=40 N
(3)
tan60°=F向/mg,所以:F向=mgtan60°=20*3^1/2 N
(4)
F向=mv^2/r,所以:v=(F向*r/m)^1/2=30^1/2 m/s
(5)
ω=v/r=(30^1/2)/(3^1/2)=10^1/2 rad/s
(6)
T=2π/ω=2π/(10^1/2)=(10^1/2)π/5 s