Amass weighing 4 lb stretches a spring 1.5 in. the mass is given a positive displacement of 2 in from its equilibrium position and released with no initial velocity. assuming that there is no damping and that the mass is acted on by an external force of 2 cos 3t lb, formulate the initial value problem describing the motion of the mass. (a computer algebra system is recommended.)

i wanna say it’s between b and d, leaning more towards b.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.