Find the moment

1. The problem statement, all variables and given/known data



see the attachment



2. Relevant equations



don't know.



3. The attempt at a solution



I really don't know how to solve it but i suppose that i need to use unit vector maybe? ( see the attached file)

1. The problem statement, all variables and given/known data







2. Relevant equations







3. The attempt at a solution

1. The problem statement, all variables and given/known data







2. Relevant equations







3. The attempt at a solution

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