1. Not finding help here? Sign up for a free 30min 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!

Conservation of momentum and energy

  1. Mar 14, 2005 #1
    Conservation of momentum and energy :D

    :frown: Wats this question on bout?

    1. [HRW6 10.P.026.] In Fig. 10-32a, a 4.00 g bullet is fired horizontally at two blocks at rest on a frictionless tabletop. The bullet passes through the first block, with mass 1.20 kg, and embeds itself in the second, with mass 1.80 kg. Speeds of 0.630 m/s and 1.40 m/s, respectively, are thereby given to the blocks (Fig. 10-32b). Neglect the mass removed from the first block by the bullet.
    (a) Find the speed of the bullet immediately after it emerges from the first block.
    (b) Find the bullet's original speed.
     
  2. jcsd
  3. Mar 14, 2005 #2

    Galileo

    User Avatar
    Science Advisor
    Homework Helper

    As it says, use conservation of momentum and energy.

    Calculate the initial momentum and energy.
    Calculate the momentum and energy after the bullet passes the first block.
    Calculate the final momentum and energy after the bullet is embedded in the second block.

    The momentum and energy don't change throughout the process.
     
  4. Mar 14, 2005 #3
    Thnx for that help, it was really confusin me!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?