3) A soccer ball has a mass of 0.40kg. Initially it is moving to the left at 20.

Question

3) A soccer ball has a mass of 0.40kg. Initially it is moving to the left at 20. m/s, but then it is kicked and given a velocity at 45o upward and to the right, with magnitude 30. m/s. Find the impulse that acted on the soccer ball and the average net force that acted on it (magnitude and direction), assuming a collision time 0.010 s.

4) A marksman holds a rifle of mass 3.00 kg loosely in his hands, so as to let it recoil freely when fired. He fires a bullet of mass 5.00 g horizontally with a velocity 300. m/s.

a) What is the recoil velocity of the rifle?

b) What are the final momentum and kinetic energy of the bullet?

c) What are the final momentum and kinetic energy of the rifle?

5) Two gliders move toward each other on a frictionless linear air track. Glider A has mass 0.50 kg. Glider B has mass 0.30 kg. Glider A has a velocity of 2.0 m/s to the right. Glider B has a velocity of 2.5 m/s to the left. After they collide, glider B moves away with a final velocity of 2.0 m/s to the right.

a) What is the final velocity of glider A?

b) How do the changes in momentum and velocity compare for the two gliders?

6) Now suppose the gliders in the previous problem collide completely inelastically so that they stick together rather than rebounding off each other after they collide. Their masses and initial velocities are the same as in that problem.

a) Find their common final velocity.

b) Compare the initial and final kinetic energies.

Explanation / Answer

? = bullet
?? = rifle
?P = momentum
?M = mass
?V = velocity?

???(M?)?

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