I am wondering how to go about relating angular momentumto the initial angular v

Question

I am wondering how to go about relating angular momentumto the initial angular velocity of the particle in thisproblem. Any help would be much appreciated.
The figure below shows a thin, uniform bar of lengthD = 1.19 m and massM = 0.71 kg pivoted at the top.The rod, which is initially at rest, is struck by a particle whosemass is m = 0.30 kg at a point x = 0.80dbelow the pivot. Assume that the particle sticks to the rod. If themaximum angle between the rod and the vertical following thecollision is 60°, find the speed of the particle beforeimpact. I am wondering how to go about relating angular momentumto the initial angular velocity of the particle in thisproblem. Any help would be much appreciated.
The figure below shows a thin, uniform bar of lengthD = 1.19 m and massM = 0.71 kg pivoted at the top.The rod, which is initially at rest, is struck by a particle whosemass is m = 0.30 kg at a point x = 0.80dbelow the pivot. Assume that the particle sticks to the rod. If themaximum angle between the rod and the vertical following thecollision is 60°, find the speed of the particle beforeimpact.

Explanation / Answer

I can solve this for you, but I just need one small piece ofinformation clarified: the problem says the particle strikesat "a point x = 0.80d below the pivot"...   whatdoes    x = 0.80d   mean? Is "d" supposed to be the length of the rod? Or is there someother definition? . Let me know, send me a private message, and I'll come back andfinish this.

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