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A ring of radius R rolls on a horizontal...


A ring of radius `R` rolls on a horizontal ground with linear speed `v` and angular speed `omega`. For what value of `theta` the velocity of point `P` is in vertical direction `(vltRomega)`.

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If `Romegacostheta=` then velocity of point `P` is vertically upwards
`theta=+-cos^(-1)((v)/(Romega))`
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