Part A Express your answer in terms of the variables k1, m, and k2. ? keff-a %3D Part B Express your answer in terms of the variables k1, m, and k2. ? keff-b = Part C Express your answer in terms of the variables k1, m, and k2. keff-c = Part D An object with mass m, suspended from a uniform spring with a force constant k, vibrates with a frequency f1. When the spring is cut in half and the same object is suspended from one of the halves, the frequency is f2. What is the ratio :? fi Express your answer in terms of the variables k and m. ? fi