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songoku
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Homework Statement
A point object of mass m is connected to an inertialess string of length L. The other end of which is fixed to a point O. At time t = 0, the object is assumed to begin to move horizontally in a vertical plane from the bottom point A (OA = L) in the clockwise direction with an initial speed Vo. If [tex]\sqrt{2gL}[/tex] < Vo < [tex]\sqrt{5gL}[/tex] (g=acceleration due to gravity), then at a point B the magnitude of the force acting on the object from the string becomes zero, where OB = L and the velocity of the object is perpendicular to OB. We restrict ourselves to the case 0 < [tex]\theta[/tex] < [tex]\pi[/tex]/2. From the point B, for a while, the object takes a parabolic orbit till a point C, where OC = L. In the case [tex]\theta[/tex] = [tex]\pi[/tex]/3, find the angle [tex]\varphi[/tex]
Homework Equations
The Attempt at a Solution
I've found the speed V = [tex]\sqrt{gL sin\theta}[/tex] and the initial speed Vo = [tex]\sqrt{(2+3sin\theta)gL}[/tex]. I also got the maximum elevation (with respect to the location B) = [tex]\frac{V^2 cos^2\theta}{2g}[/tex]
What should i do next?
thx