(1). A 330 g bird flying along at 6.2 m/s sees a 9.0 ginsect heading straight to

Question

(1). A 330 g bird flying along at 6.2 m/s sees a 9.0 ginsect 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?

(2).A package of mass m is released from rest at a warehouse loading dock and slides down the h = 4.0 m- high, frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having removed the previous package, of mass 2m, from the bottom of the chute. A. Suppose the packages stick together. What is their common speed after the collision?

B. Suppose the collision between the packages is perfectly elastic. To what height does the package of mass m rebound?

(3).A 69.0 kg football player is gliding across very smooth ice at 2.05 m/s . He throws a 0.470 kgfootball straight forward.What is the player's speed afterward if the ball is thrown at 18.0 m/s relative to the ground? What is the player's speed afterward if the ball is thrown at 18.0 m/s relative to the player?

Explanation / Answer

momentum , p = mass x velocity

P (initial) = P (final)

Therefore

m1v1 + m2v2 = mfvf

0.33*6.2 + (0.009*-30) = mv

1.776 = mv

1.776 = (0.33 + 0.009) *v

v = 5.24 m/s

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