By What Angle Did The Falcon Change The Raven's Direction Of Motion?

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Bird Standoff Problem

• Thread starter mnafetsc
• Start appointment Jun 26, 2010

Homework Statement

To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at loftier speed. In 1 such episode, a 620 g falcon flight at twenty.0 1000/s hit a 1.twoscore kg raven flying at 9.0 chiliad/south. The falcon hit the raven at right angles to its original path and bounced back at five.0 m/s. (These figures were estimated by the author as he watched this assail occur in northern New United mexican states.)

A.By what bending did the falcon alter the raven'due south management of motion?
B.What was the raven'south speed correct after the collision?

Homework Equations

P=mv

conservation of momentum

The Endeavor at a Solution

I put the falcon on the y axis and the raven on the x axis, I ten tried to find the a and y components of p so did theta= arctan9p2/p1) which gave me 45 degrees-wrong

I and so tried to find the 10 and y components using
m_F_v_Fi + m_R_V_Ri = m_F_v_Ff + m_R_V_Rf

Solving for v_Rf for the x and y compents I got ix and 8.sixteen respectively, the had theta= arctan(viii.16/9)= 42 degrees once more wrong.

Answers and Replies

Homework Statement

To protect their young in the nest, peregrine falcons will fly into birds of prey (such equally ravens) at high speed. In one such episode, a 620 g falcon flying at 20.0 one thousand/s hit a 1.40 kg raven flying at 9.0 1000/s. The falcon hit the raven at correct angles to its original path and bounced back at 5.0 1000/s. (These figures were estimated by the author as he watched this attack occur in northern New Mexico.)

A.By what angle did the falcon change the raven's direction of motion?
B.What was the raven'south speed right later on the standoff?

Homework Equations

P=mv

conservation of momentum

The Attempt at a Solution

I put the falcon on the y axis and the raven on the x axis, I 10 tried to notice the a and y components of p then did theta= arctan9p2/p1) which gave me 45 degrees-wrong

Precisely how did you go that? Are you assuming a perfectly rubberband collision? That'south probably not correct. What percentage inelasticity are you assuming?

I then tried to find the x and y components using
m_F_v_Fi + m_R_V_Ri = m_F_v_Ff + m_R_V_Rf

Solving for v_Rf for the x and y compents I got ix and 8.16 respectively, the had theta= arctan(8.16/9)= 42 degrees again incorrect.

Pretty much I did p=sqrt(p_1_^two +p_2_^2

But I realize that is wrong because its not elastic situation, I know is inelastic, but not perfectly inelastic then I used the second equation thinking that would piece of work, I'm non quite sure were to get from there.

Never heed I was doing it correctly, I just kept making some unknown calculation fault that kept giving me the wrong angle.

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