1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Physics Help

  1. Jun 12, 2005 #1
    12. A hiker hears an echo 1.5 s after shouting over a valley. Estimate the width of the valley.

    6. Two billard balls of equal mass undergo a perfeclty elastic head-on collison. If the speed of the white ball was initaially 2.00 m/s, and of the 8-ball 3.00 m/s in the oposite direction, what will be the final speed of the 8-ball?

    7. A ball of the mass 2.0 kg moving east with a speed of 4.0 m/s collides head-on with a 0.92 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?
  2. jcsd
  3. Jun 12, 2005 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Please note that:

    1. We have a HW help section

    2. You have to show what you have done, or at least know SOMETHING about the question. We do not solve the problem for you.

    Please read the Sticky in this section.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Physics Help
  1. Physics help. (Replies: 4)

  2. Physics Help (Replies: 1)

  3. Physics Help (Replies: 2)