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A 50 g spring is made from a new steel/titanium alloy. Engineers determine that if a 500 g mass is hung from the spring it oscillates with a period of exactly 1.00 seconds. What is the spring's constant?

Equation used is = system mass = hanging mass + (1/3) spring mass

system mass = 500 + (1/3)50 = 516.6666667

Now I have to use the equation Period^2 = 4pi^2 system mass/spring constant.

I have to solve for mass and don't know how to turn this last equation around.