Determine the distance y between the 50.0 cm mark and the centre of the object Q.
Calculate the weight W of object Q, using the equation $W = \frac{x}{y} \times 2.0\,\text{N}$. Give your answer to a suitable number of significant figures for this experiment.
Calculate a revised value for the weight W of object Q, using the equation $W = \frac{x}{y} \times 3.0\,\text{N}$. Give your answer to a suitable number of significant figures for this experiment.
State and explain whether your two values of W are equal within the limits of experimental accuracy. Use the values of W in your answer.
Explain how you ensure that the centre of object Q is directly over the 90.0 cm mark of the metre ruler. You may draw a diagram.
It is difficult to find the position of the load to obtain the exact balance of the metre ruler. Explain how you try to overcome this difficulty.
Determine the distance d from the 50.0 cm mark on the metre ruler to the centre of mass. Show your working.