In this experiment, you will investigate the equilibrium of a metre rule. (a) You have been provided with a metre rule with a string attached to it. • Set up the apparatus as shown in Fig. 1.1. [Figure 1.1] • Add masses to the mass hanger so that mass m is 80 g. • Adjust the pivot so that it is 5mm from end B of the rule. The distance between the string at end A and the pivot is L. • Measure and record L. L = • Adjust the string loop supporting the 100g mass so that it is approximately 60cm from end A. • Hold the rule at end A so that the rule is approximately horizontal. • Adjust the position of the string loop to find the position where end A is just about to move upwards when the rule is released. The distance between the string at end A and the string loop is y₁ as shown in Fig. 1.2. [Figure 1.2] • Measure and record y₁. y₁ = • Adjust the position of the string loop to find the position where end A is just about to move downwards when the rule is released. The distance between the string at end A and the string loop is y2. • Measure and record y2. y₂ = • Calculate y where y = (y₁ + y₂) / 2 y =