Identify and explain three ways in which pesticides find their way into waterways

If you put a helium-filled balloon in the refrigerator, what will happen?

Frequency of electromagnetic waves that a radio station is assigned is called

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?