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A pipe which can be swiveled in a ver...

A pipe which can be swiveled in a verticle plane is mounted on a cart . The cart moves uniformly along a horizontal path with a velocity `v_(1) = 2m//s` . At what angle `alpha` ot the horizontal should the pipe be placed so that drop of rain falling verticle with a velcoity `v_(2) = 6m//s` move parallel to the walls of the pipe without touching them .

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The correct Answer is:
`tan^(-1)3`
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