As you stand on the sidewalk outside an apartment building, a 2.0-kg bird flies

Question

As you stand on the sidewalk outside an apartment building, a 2.0-kg bird flies toward you at 2.5 m/s along a straight line that passes 3.0 m above your head and runs parallel to the street. A friend is reclining with his head 4.0 m directly above your head, watching from a balcony. What angular momentum do you observe the bird to have, using your head as a reference point Express your answer with the appropriate units. What angular momentum does your friend observe the bird to have, using his own head as a reference point Express your answer with the appropriate units.

Explanation / Answer

Here ,

mass of bird , m = 2 Kg

speed , v = 2.5 m/s

distance of bird from my head , h = 3 m

part A)

angular momentum wrt my head = m * v * h

angular momentum wrt my head = 2 * 2.5 * 3

angular momentum wrt my head = 15 Kg.m^2/s

the angular momentum wrt my head is 15 Kg.m^2/s

part B)

Using his own head as reference ,

height of bird from his head , h1 = 4 - 3 = 1 m

angular momentum wrt his head = m * v * h1

angular momentum wrt his head = 2 * 2.5 * 1

angular momentum wrt his head = 5 Kg.m^2/s

the angular momentum wrt his head is 5 Kg.m^2/s

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