Chrome File Edit View History Bookmarks People Window Help Mastering Physics: Ch

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Chrome File Edit View History Bookmarks People Window Help Mastering Physics: Ch 09 HW Secure https session.masteringphysics.com 74789483 Physics 201: section 20 Ch 09 HW Problem 9.17 Problem 9.17 Part A A 250 g bird flying along at 5.6 m/s sees a 12 g insect What is the bird's speed immediately after swallowing? heading straight toward it with a speed of 29 m/s (as Express your answer to two significant figures and include the appropriate units. measured by an observer on the ground, notby the bird). The bird opens its mouth wide and enjoys a nice lunch 3.7404. Submit My Answers Give Up incorrect; Try Again; 3 attempts remaining Thu 9:27 PM Signed in as Help Close Resources previous I 6 of 11 l next rovide Feedba Continue

Explanation / Answer

here,

mass of bird, mb = 250g = 0.250 kg
velocity of bird, vb = 5.6 m/s

mass of insect, mi = 12g = 0.012 kg
velocity of insect, vi = - 29 m/s

From conservation of momentum we have :
before collision = after collision

mb*vb + mi * - vi = (mi + mb)*V

velocity after eating, V = (mb*vb - mi*vi)/(mi + mb)

velocity after eating, V = (0.250*5.6 - 0.012*29)/(0.012 + 0.250)

velocity after eating, V = 4.015 m/s

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