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: Springs and masses

  1. Oct 31, 2006 #1
    A spring with k = 47 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.7 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks?

    I got the answer to be 141 cm because I thought that the 15cm is to be converted into meters, can anyone help me with this question?
  2. jcsd
  3. Oct 31, 2006 #2
    yes the cm should be converted to metres

    what is the extension as a result of the mass being attached?
  4. Oct 31, 2006 #3
    I got 141 cm but thats not correct. I cant figure out the correct answer.
  5. Oct 31, 2006 #4
    how did u get that?
  6. Oct 31, 2006 #5
    I used 0+mg(0.15m + change in y)=0+ .5k(change in y)^2
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook