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!

Velocity of snapium given constant and weight

  1. Oct 30, 2012 #1
    1. The problem statement, all variables and given/known data

    A snapnium-loaded toy launcher shoots a 22 g plastic ball. What is the launch speed if the snaptastic constant is 4.6×104 N/m3, with the units you found in part A, and the piece of snapnium is compressed 14 cm ? Assume the barrel is frictionless.

    OTHER INFO:

    A materials scientist comes up with a new elastic she calls "snapnium" that obeys the force law Fx=-q(x-xe)3, where xe is the equilibrium position of the end of the particular sample and q is the "snaptastic" constant. For simplicity, we'll let xe=0m . Then Fx=-qx3.

    2. Relevant equations

    U(x)= (qx4)/4

    part A was finding units of q, which were N/m3

    3. The attempt at a solution

    The answer is 20 m/s, but I have no idea how to do it. Can someone explain to me what the process is to get to this answer?
     
  2. jcsd
  3. Oct 31, 2012 #2
    Use conservation of total energy.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook