Place the threads at a distance of a=20 cm. Investigate the mixed oscillations described in Part 1 for different positions of the nuts with z>10 cm.
4.1 Measure the dependence of the number of longitudinal oscillations in the cycle NC on the position of the nuts z. You may not be able to do this for all z values!
4.2 Based on the results of parts 2 and 3, calculate the periods of torsional oscillations for all values of z at which the measurements have carried out in section 4.1.
4.3 Present the measurement results in such a graphical form that they confirm the validity of the formula for the value NC obtained in part 1.