Peregrine falcons frequently grab prey birds from the air, as bi0 in example 9.10. sometimes they strike at high enough speeds that the force of the impact disables prey birds. a 480 g per- egrine falcon high in the sky spies a 240 g pigeon some dis- tance below. the falcon slows to a near stop, then goes into ve-called a stoop-and picks up speed as she falls. the n reaches a vertical speed of 45 m/s before striking the pigeon, which we can assume is stationary. the falcon strikes the pigeon and grabs it in her talons. the collision between the falco birds lasts 0.015 s. a. what is the final speed of the falcon and pigeon? b. what is the average force on the pigeon during the impact?

A) 30 m/s

The problem can be solved by using the law of conservation of momentum. In fact, the total momentum falcon+pigeon before the collision must be equal to the total momentum falcon+pigeon after the collision:

where

mf = 0.480 g is the mass of the falcon

uf = 45 m/s is the initial velocity of the falcon

mp = 0.240 g is the mass of the pigeon

up = 0 is the initial velocity of the pigeon

v is the final combined velocity of pigeon+falcon

Solving the equation for v, we find

B) 480 N

The average force on the pigeon during the impact is given by

where

is the change in momentum of the pigeon

is the duration of the collision

here we have:

- Change in momentum of the pigeon:

- Duration of the collision:

So the average force is

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

not moving. pos accel,