Joke Collection Website - Cold jokes - The radius of the vertically placed smooth iron ring is R=20cm, and there is a perforated ball M on the ring, which can only slide along the ring without friction.
The radius of the vertically placed smooth iron ring is R=20cm, and there is a perforated ball M on the ring, which can only slide along the ring without friction.
N*cosθ = m*g
N*sinθ = m*R*sinθ*ω^2
At the same time in two forms.
cosθ= g/(r*ω^2)= 10/(0.20* 10^2)= 0.5
θ = 60
In fact, a special angle θ = 0 also meets the requirements.
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