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!

Homework Help: Just one example question

  1. Feb 14, 2006 #1
    i really need help with this- i partially understand it, but i'm not sure exactly how to do this problem.

    a 44 g bullet strikes and becomes embedded in a 1.54 kg block fo wood placed on a horizontal surface just in front of the gun. if the coefficient of friction between the block and surface is equal to .28 and the impact drives the block a distance of 18 m before it comes to rest, what was the muzzle speed of the bullet?

    can anyone help?
  2. jcsd
  3. Feb 14, 2006 #2
    use energy and momentum. what collison happens?
  4. Feb 14, 2006 #3
    i realize that impulse equals force times the change in time, which equals momentum, but i don't know how to apply these when there are two masses, and the coefficient of friction is involved. in all my previous problems, the necessary info was less and easier... :-\
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook