A 0.35-kg ball attached to a string is rotating in a horizontal circle of radius 0.43 m. Assume the tension force is directed horizontally. If the ball revolves twice every second, what is the tension in the string?

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?