(a)[1]
On Fig. 3.2, draw the graph’s outline for loads above $7.0\,\text{N}$.
(b)[2]
All loads are removed from the spring. A wooden block is then hung from the lower end of the spring. The spring length changes from $4.9\,\text{cm}$ to $13.4\,\text{cm}$. Calculate the weight of the wooden block.
(c)[2]
The student takes a second spring identical to the one in Fig. 3.1 and hangs it beside the first spring. Fig. 3.3 shows a light rod passing through the rings at the lower ends of the springs. The student repeats the experiment and increases the load gradually to $9.0\,\text{N}$. State and explain whether the limit of proportionality is reached.