using an electron microscope, jane measured a rod shaped bacterium and found it to be 0.00000345 meters in length. list the steps she should take to represent this number in scientific notation

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?