To remove a tight fitting lid from a jar, megan runs the lid under hot water. what happenes to the jar lid when its temperature increases? (a) the temperature increases, the lid expands (b) the potential energy decreases, and the lid expands (c) the potential energy increases, and the lid contracts (d) the temperature decreases, and the lid contracts

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?