1. Fig. 3.1 shows a horizontal rod of length 2.4 m and weight 160 N. The weight of the rod acts at its centre. The rod is suspended by two vertical ropes X and Y. The tension in each rope is 80 N.

(i) State the name given to the point at which the weight of the rod acts.

[1]

(ii) Calculate the mass of the rod.    

mass = ......................................................... [1]

(iii) The rod is in equilibrium.  

Using data from Fig. 3.1, explain why.

[4]