- #1
cse63146
- 452
- 0
[SOLVED] Momentum Question
A 300 g bird flying along at 6 m/s sees a 10 g insect heading straight toward it with a speed of 30 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch.
What is the bird's speed immediately after swallowing?
[tex]p_{1}[/tex] = [tex]p_{2}[/tex]
I know relative speed is the sum of the bird's and bug's speed since they are headed in opposite direction, and 30 + 6 = 36 so
[tex]m_{bird}[/tex][tex]v_{bird}[/tex] + [tex]m_{bug}[/tex][tex]v_{bug}[/tex] = ([tex]m_{bird}[/tex] + [tex]m_{bug}[/tex])[tex]v_{final}[/tex]
0.3(36) + 0.01(36) = (0.3 + 0.01)[tex]v_{f}[/tex]
[tex]v_{f}[/tex] = (0.3(36) + 0.01(36))/0.31 = 34.87 m/s
but this is wrong, probably because the relative speed. Any suggestions? Thanks.
Homework Statement
A 300 g bird flying along at 6 m/s sees a 10 g insect heading straight toward it with a speed of 30 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch.
What is the bird's speed immediately after swallowing?
Homework Equations
[tex]p_{1}[/tex] = [tex]p_{2}[/tex]
The Attempt at a Solution
I know relative speed is the sum of the bird's and bug's speed since they are headed in opposite direction, and 30 + 6 = 36 so
[tex]m_{bird}[/tex][tex]v_{bird}[/tex] + [tex]m_{bug}[/tex][tex]v_{bug}[/tex] = ([tex]m_{bird}[/tex] + [tex]m_{bug}[/tex])[tex]v_{final}[/tex]
0.3(36) + 0.01(36) = (0.3 + 0.01)[tex]v_{f}[/tex]
[tex]v_{f}[/tex] = (0.3(36) + 0.01(36))/0.31 = 34.87 m/s
but this is wrong, probably because the relative speed. Any suggestions? Thanks.
Last edited: