As you stand on the sidewalk outside an apartment building, a \(2.0-\mathrm{kg}\) bird flies toward you at \(2.0 \mathrm{~m} / \mathrm{s}\) along a straight line that passes \(3.0 \mathrm{~m}\) above your head and runs parallel to the street. A friend is reclining with his head \(4.0 \mathrm{~m}\) directly above your head, watching from a balcony.

(a) What magnitude of the angular momentum do you observe the bird to have, using your head as a reference point? 

\((b)\) What magnitude of the angular momentum does your friend observe the bird to have, using his own head as a reference point?