March 13th, 2018, 05:07 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 05:10 AM. 
March 13th, 2018, 06:50 AM  #2 
Senior Member Joined: Oct 2009 Posts: 629 Thanks: 192 
Do you know the formula for the frequency/period of a pendulum?

March 13th, 2018, 06:59 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,974 Thanks: 1850 
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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