Wave and phasors

A taut string was at rest along the X axis, but now a transverse harmonic wave of period T, wavelength λ and phase velocity v propagates along it, according to the following equations:
y = A cos(k x - ω t)
z = 0
where k = 2π/λ and ω = 2π/T. The simulation will display at some points the phasor of the corresponding harmonic motion:
y + i z = A eⁱ^{(k x - ω t)}

The point of view of the three-dimensional projection can be changed with the cursors or the mouse.
The whole image can be moved with the mouse while pressing Ctrl.
To change the zoom in the projection, press Shift when moving up or down the mouse pointer.
Put the mouse pointer over a control to get information about it.

Activities

Which is the frequency of the phasors?
How is their motion (as seen from the positive direction of the X axis): clockwise or anticlockwise? Why?
Which is the phase difference between phasors located at x and x+Δx?

This is an English translation of the Basque original for a course on mechanics, oscillations and waves.
It requires Java 1.5 or newer and was created by Juan M. Aguirregabiria with Easy Java Simulations (Ejs) by Francisco Esquembre. I thank Wolfgang Christian and Francisco Esquembre for their help.