# AB is diameter of a circle in vertical plane. PQ is another diameter inclined at an angle of θ to AB. Find ........?

AB is diameter of a circle in vertical plane. PQ is another diameter inclined at an angle of θ to AB. Find θ so that the time of sliding down PQ = 2 ( the time sliding down along AB )

Update:

Oubaas:

Sliding time from P to Q = 2 * (time taken to slide down from A to B). Neglect Friction.

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