A 4 m long rod of negligible weight is to be balanced about a point 125 cm from the one end. A load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.
(a) A weight W is placed 250cm from the support on the longer arm. Find W.
(b) If W=5 kgf, where must it be kept to balance the rod?
(c) To which class of lever does it belong?