March 13th, 2018, 04:07 AM  #1 
Newbie Joined: Feb 2018 From: Afghanistan Posts: 17 Thanks: 0  Simple pendulum problem please explain step by step
Last edited by Marva; March 13th, 2018 at 04:10 AM. 
March 13th, 2018, 05:50 AM  #2 
Senior Member Joined: Oct 2009 Posts: 753 Thanks: 258 
Do you know the formula for the frequency/period of a pendulum?

March 13th, 2018, 05:59 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,370 Thanks: 2007 
As the pendulum's frequency is inversely proportional to the square root of its length, L$_1$/L$_2$ = (f$_2$/f$_1$)Â² = 16. 

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