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

 

More Numerical Based on Machine class 10 

The fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance 15 cm from the fulcrum. Find : (i) the mechanical advantage of fire tongs and (ii) the effort needed.