Physics

posted by .

A rubber ball is thrown against the wall. The ball has a mass of 4 g and strikes the wall perpendicularly with a speed of 12 m/s. The acceleration is constant while the ball is touching the wall. After touching the wall, the center of mass moves .5 cm toward the wall, and back out from the wall.

what is the magnitude of the time average force?

>>First I found the impulse delivered by the wall which is Px'-Px (momentum) = .096 N/s. Then I tried to find the change in time by taking (.5*2*(1/1000))/12. For this change in time i got 8.33E-4. However, the answer .096/8.33E-4 was incorrect. Help!

  • Physics -

    The average velocity from first impact to turnaround (maximum compression) is 6 m/s. The time required to reach maximum compression (at constant acceleration) is T = 0.5 cm/(600 cm/s)= 8.3*10^-4 s. Acceleration is
    a = (delta V)/T
    a = (12 m/s)/(8.3*10^-4s) = 14,400 m/s^2

    M = m a = (0.004 kg)(14,400 m/s^2) = 57.6 N

    I understand how you got the impulse. The units of momentum are not N/s. The time agrees with mine, but mine is half the total interval of contact, and yours is the total time of contact. Something is wrong there

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A girl of mass 60 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average …
  2. Physics URGENT

    A tennis ball with a velocity of +10.7m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -5.9 m/s (to the left). If the ball is in contact with …
  3. Physics

    A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average …
  4. physics

    I have been stuck on this for a while now and cant figure out what it is i am doing wrong HELP!!! A tennis ball with a velocity of 15.5 m/s is thrown perpendicularly at a wall. After strik- ing the wall, the ball rebounds in the opposite …
  5. Physics

    A tennis ball with a speed of 5.0 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 3.0 m/s. If the ball is in contact with the wall for 0.013 s, what is the …
  6. physics

    A tennis ball with a speed of 6.0 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 4.0 m/s. If the ball is in contact with the wall for 0.012 s, what is the …
  7. Physics

    A tennis ball with a velocity of 24.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 16 m/s. If the ball is in contact with the wall for 0.013 s, what is …
  8. physics

    A tennis ball with a velocity of +9.6 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -5.8 m/s (to the left). If the ball is in contact with …
  9. physics

    -------------------------------------------------------------------------------- A tennis ball with a speed of 11.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with …
  10. physics

    A tennis ball with a velocity of 30.0 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -8 m/s to the left. If the ball is in contact with …

More Similar Questions