Using Fig. 8.1, determine the load on the spring when the extension is $4.9\,\text{cm}$.
Point X on Fig. 8.1 marks the limit of proportionality for the spring. On Fig. 8.1, sketch a line to show how the extension-load graph could proceed after X.
Calculate the pressure produced by the water at a depth of $3.5\,\text{cm}$ beneath the water surface.
Calculate the upward force on the base of the block caused by the water pressure.
In Fig. 8.2, the spring extension is $4.9\,\text{cm}$. Use the answer from (a)(i) together with the answer from (b)(ii) to determine the weight of the block.
Explain why, in this experiment, atmospheric pressure has no effect on the position of the plastic block in the water.
Force is a vector quantity, while pressure is a scalar quantity. State the difference between a vector quantity and a scalar quantity.
The beaker in Fig. 8.2 is slowly raised so that a greater fraction of the plastic block is in the water. Explain what happens to the forces acting on the block.