In what do electromagnetic waves cause disturbances when they transfer energy?
A. Electric fields only
O B. Both electric and magnetic fields
C. Neither electric nor magnetic fields
O D. Magnetic fields only

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?