The weight W of a traveling crane is 20 tons acting as shown in Fig. P-343. To prevent the crane from tipping to the right when carrying a load P of 20 tons, a counterweight Q is used. Determine the value and position of Q so that the crane will remain in equilibrium both when the maximum load P is applied and when the load P is removed.
→ Equation (1)
When load P is applied
From Equation (1), Qx = 120, thus,
Substitute Q = 20 tons to Equation (1)