Question 4 - Method of Virtual Work Two 7.5-kg bars AB and BC are connected by a pin at B and by a spring DE. Knowing that the spring is 150 mm long when unstretched and that the constant of the spring is 1 kN/m, determine the value of x corresponding to equilibrium. Use the method of virtual work (potential energy). A/ 200 mm D. 400 mm 400 mm 200 mm Marking guide: Sketch an active fore diagram and show the datum for zero gravitational potential energy - 3 marks Calculate the total potential energy of the mechanical system - Define the equilibrium position- Calculate the value of x

Question 4 - Method of Virtual Work Two 7.5-kg bars AB and BC are connected by a pin at B and by a spring DE. Knowing that the spring is 150 mm long when unstretched and that the constant of the spring is 1 kN/m, determine the value of x corresponding to equilibrium. Use the method of virtual work (potential energy). A/ 200 mm D. 400 mm 400 mm 200 mm Marking guide: Sketch an active fore diagram and show the datum for zero gravitational potential energy - 3 marks Calculate the total potential energy of the mechanical system - Define the equilibrium position- Calculate the value of x