Is density a physical change, chemical change, physical property, or a chemical property?

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?