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## Homework Statement

There is a spring with 2 masses with a combined mass of 0.69kg. The vertical oscillation has a frequency of 1.5Hz. The amplitude of the oscillation is 30mm.

Now this spring is attached to a horizontal support rod that can be made to oscillate vertically.

how do i work out the phase difference with the driver (the spring)?

## Homework Equations

## The Attempt at a Solution

If it oscillates with a frequency of 0.2Hz the amplitude will be less than resonance and there will be forced vibrations. , but how do i work out the phase difference with the driver (the spring)?