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The total momentum of a flock of identical birds could be zero only if the birds are

a) taking off from the ground.

b) flying in the same direction.

c) flying in different directions.

d) very tired and coming down to rest.

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Deanna Hettinger
Deanna HettingerLv2
7 Apr 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

As preparation for this problem, review Conceptual Example 10. The drawing shows two planes each about to drop an empty fuel tank. At the moment of release each plane has the same speed of 125 m/s, and each tank is at the same height of 1.00 km above the ground. Although the speeds are the same, the velocities are different at the instant of release, because one plane is flying at an angle of 15.0° above the horizontal and the other is flying at an angle of 15.0° below the horizontal. Find the magnitude and direction of the velocity with which the fuel tank hits the ground if it is from plane A. Give the directional angles with respect to the horizontal.

To protect their young in the nest, peregrine falcons will fly intobirds of prey (such as ravens) at high speed. In one such episode,a 600 falcon flying at 20.0 ran into a 1.50 raven flying at 9.00 .The falcon hit the raven at a right angle to its original path andbounced back with a speed of 5.00 . By what angle did the falconchange the raven's direction of motion?

A) Give the final x and y components of the momentum of the falcon:and . Note that the final components of momentum are the componentsof momentum after the collision.
B) Give the final x and y components of the momentum of the raven:and . Note that the final components of momentum are the componentsof momentum after the collision.
Since these quantities are unknown, you will need to use symbols toexpress the unknown terms. In particular, use the symbol for theangle between the raven's direction of motion after the collisionand the positive x axis, and for the raven's final speed.

Express your answers and separated by commas using the variables ,for the angle that the raven's direction of motion makes with thepositive x axis, and , for the raven's final speed.

C)Despite being only about one-third the mass of the raven, thefalcon successfully diverts the raven's direction of motion by arelatively large angle. This is because of the initial high speedof the falcon. In fact, by what angle would the falcon change theraven's direction of motion if it were to hit the raven at a lowerspeed, for example at a speed equal to the raven's initial speed?Assume that the raven has the same final speed as above and thefalcon has the same final velocity as given in theintroduction.
Express your answer in degrees to two sigificant figures.

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is

a) larger than the change in momentum of the larger mass.

b) equal to the change in momentum of the larger mass.

c) smaller than the change in momentum of the larger mass.

d) zero. 

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