73. (a) The diagram below shows the particles and their lines of motion. The origin is marked Oand may be anywhere. The angular momentum of particle 1 has magnitude ()111sinmvrmv dhθ==+Aand it is into the page. The angular momentum of particle 2 has magnitude A222mvrmvhsinand it is out of the page. The net angular momentum has magnitude 452(2.90 10 kg)(5.46 m/s)(0.042 m)6.65 10 kg m /s.Lmvdh mvhmvd−−=+−==×⋅and is into the page. This result is independent of the location of the origin.
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