1. The problem statement, all variables and given/known data
The length of the rod of a certain pendulum is decreased, and the period then decreases by 20%. By how much was the rod length decreased?
2. Relevant equations
T=2π√(l/g)
T=period
l=length of the rod
g=acceleration due to gravity
3. The attempt at a solution
I know how to solve the problem, I just don't know how to do the math to solve for l (length).
The length of the rod of a certain pendulum is decreased, and the period then decreases by 20%. By how much was the rod length decreased?
2. Relevant equations
T=2π√(l/g)
T=period
l=length of the rod
g=acceleration due to gravity
3. The attempt at a solution
I know how to solve the problem, I just don't know how to do the math to solve for l (length).
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