a 2. A small ring is threaded on a fixed and smooth vertical circular wire of radius a and centered at O. It is projecte

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A 2 A Small Ring Is Threaded On A Fixed And Smooth Vertical Circular Wire Of Radius A And Centered At O It Is Projecte 1 (27.55 KiB) Viewed 40 times

a 2. A small ring is threaded on a fixed and smooth vertical circular wire of radius a and centered at O. It is projected from the lowest point with velocity 2ga and it slides on the wire. The line joining the ring and point O makes an angle with the lower vertical through O. Please take O as the reference zero of the gravitational potential. (a) Show that the reaction between the ring and the wire vanishes when cos 0 = -2/3 (8 marks) bt In. [Hint:S sec @ do = In(sec 0 + tan ).] (8 marks) (b) Show that the the reaction force vanishes when the time t is given by Vin(15+ Vē).